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PS2032D 05/17/99
Product Description
Pericom Semiconductor's PI74FCT series of logic circuits are
produced using the Company's advanced 0.6 micron CMOS
technology, achieving industry leading speed grades.
The PI74FCT16245T, PI74FCT162245T, and PI74FCT162H245T
are 16-bit bidirectional transceivers designed for asynchronous
two-way communication between data buses. The direction control
input pin (xDIR) determines the direction of data flow through the
bidirectional transceiver. The Direction and Ouput Enable controls
are designed to operate these devices as either two independent
8-bit transceivers or one 16-bit transceiver. The output enable (OE)
input, when HIGH, disables both A and B ports by placing them in
HIGH Z condition.
The PI74FCT16245T output buffers are designed with a Power-
Off disable allowing "live insertion" of boards when used as
backplane drivers.
The PI74FCT162245T has
24mA balanced output drivers. It is
designed with current limiting resistors at its outputs to control the
output edge rate resulting in lower ground bounce and undershoot.
This eliminates the need for external terminating resistors for most
interface applications.
The PI74FCT162H245T has "Bus Hold" which retains the input's
last state whenever the input goes to high-impedance preventing
"floating" inputs and eliminating the need for pull-up/down resistors
.
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Logic Block Diagram
Product Features
Common Features
PI74FCT16245T, PI74FCT162245T and PI74FCT162H245
are high-speed, low-power devices with high-current drive
V
CC
= 5V 10%
Hysteresis on all inputs
Packages available:
48-pin 240 mil wide plastic TSSOP (A48)
48-pin 173 mil wide plastic TVSOP (JEDEC TSSOP K48)
48-pin 300 mil wide plastic SSOP (V48)
PI74FCT16245T Features
High output drive: I
OH
= 32mA; I
OL
= 64mA
Power off disable outputs permit "live insertion"
Typical V
OLP
(Output Ground Bounce)
< 1.0V at V
CC
= 5V, T
A
= 25C
PI74FCT162245T Features
Balanced output drivers:
24mA
Reduced system switching noise
Typical V
OLP
(Output Ground Bounce)
< 0.6V at V
CC
= 5V, T
A
= 25C
PI74FCT162H245T Features
Bus Hold retains last active bus state during Three-State
Eliminates the need for external pull-up resistors
PI74FCT16245T
PI74FCT162245T
PI74FCT162H245T
Fast CMOS 16-Bit
Bidirectional Transceivers
1
B
0
1
A
0
1
OE
1
DIR
1
B
1
1
A
1
1
B
2
1
A
2
1
B
3
1
A
3
1
B
4
1
A
4
1
B
5
1
A
5
1
B
6
1
A
6
1
B
7
1
A
7
2
B
0
2
A
0
2
OE
2
DIR
2
B
1
2
A
1
2
B
2
2
A
2
2
B
3
2
A
3
2
B
4
2
A
4
2
B
5
2
A
5
2
B
6
2
A
6
2
B
7
2
A
7
PI74FCT16245T/162245T/162H245T
Fast CMOS 16-Bit Bidirectional Tranceivers
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PS2032D 05/17/99
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Product Pin Description
Pin Name
Description
xOE
3-State Enable Inputs (Active LOW)
xDIR
Direction Control Input
xAx
Side A Inputs or 3-State Outputs
(1)
xBx
Side B Inputs or 3-State Outputs
(1)
GND
Ground
V
CC
Power
Inputs
(1)
xOE
xDIR
Outputs
(1)
L
L
Bus B Data to Bus A
L
H
Bus A Data to Bus B
H
X
High Z State
Truth Table
Note:
1. H = High Voltage Level, X = Don't Care,
L = Low Voltage Level, Z = High Impedance
Product Pin Configuration
Note:
1. For the PI74FCT162H245T, these pins have "Bus Hold."
All other pins are standard, outputs, or I/Os.
48-Pin
V48
A48
K48
PI74FCT16245T/162245T/162H245T
Fast CMOS 16-Bit Bidirectional Tranceivers
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PS2032D 05/17/99
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Parameters
Description
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Units
V
IH
Input HIGH Voltage
Guaranteed Logic HIGH Level
2.0
V
V
IL
Input LOW Voltage
Guaranteed Logic LOW Level
0.8
V
I
IH
Input HIGH Current
Standard Input, V
CC
= Max.
V
IN
= V
CC
1
A
I
IH
Input HIGH Current
Standard I/O, V
CC
= Max.
V
IN
= V
CC
1
A
I
IH
Input HIGH Current
Bus Hold Input
(4)
, V
CC
= Max.
V
IN
= V
CC
100
A
I
IH
Input HIGH Current
Bus Hold I/O
(4)
, V
CC
= Max.
V
IN
= V
CC
100
A
I
IL
Input LOW Current
Standard Input, V
CC
= Min.
V
IN
= GND
1
A
I
IL
Input LOW Current
Standard I/O, V
CC
= Min.
V
IN
= GND
1
A
I
IL
Input LOW Current
Bus Hold Input
(4)
, V
CC
= Min.
V
IN
= GND
100
A
I
IL
Input LOW Current
Bus Hold I/O
(4)
, V
CC
= Min.
V
IN
= GND
100
A
I
BHH
Bus Hold
Bus Hold Input
(4)
, V
CC
= Min.
V
IN
= 2.0V
50
A
I
BHL
Sustain Current
V
IN
= 0.8V
+50
I
OZH
(5)
High Impedance
V
CC
= Max.
V
OUT
= 2.7V
1
A
I
OZL
(5)
Output Current
V
CC
= Max.
V
OUT
= 0.5V
1
A
V
IK
Clamp Diode Voltage
V
CC
= Min., I
IN
= 18mA
0.7
1.2
V
I
OS
Short Circuit Current
V
CC
= Max.
(3)
, V
OUT
= GND
80
140
200
mA
I
O
Output Drive Current
V
CC
= Max.
(3)
, V
OUT
= 2.5V
50
180
mA
V
H
Input Hysteresis
100
mV
Storage Temperature ........................................................... 65C to +150C
Ambient Temperature with Power Applied .......................... 40C to +85C
Supply Voltage to Ground Potential (Inputs & V
CC
Only) .. 0.5V to +7.0V
Supply Voltage to Ground Potential (Outputs & D/O Only) 0.5V to +7.0V
DC Input Voltage .................................................................. 0.5V to +7.0V
DC Output Current ............................................................................. 120mA
Power Dissipation ................................................................................... 1.0W
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the
device. This is a stress rating only and functional
operation of the device at these or any other condi-
tions above those indicated in the operational
sections of this specification is not implied.
Exposure to absolute maximum rating conditions for
extended periods may affect reliability.
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 5.0V, +25C ambient and maximum loading.
3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
4. Pins with Bus Hold are identified in the pin description.
5. This specification does not apply to bi-directional functionalities with Bus Hold.
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
DC Electrical Characteristics
(Over the Operating Range, T
A
= 40C to +85C, V
CC
= 5.0V
10%)
PI74FCT16245T/162245T/162H245T
Fast CMOS 16-Bit Bidirectional Tranceivers
4
PS2032D 05/17/99
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Parameters
Description
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Units
V
OH
Output HIGH Voltage
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OH
= 3.0mA
2.5
3.5
V
I
OH
= 15.0mA
2.4
3.5
I
OH
= 32.0mA
2.0
3.0
V
OL
Output LOW Voltage
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OL
= 64mA
0.2
0.55
V
I
OFF
Power Down Disable
V
CC
= 0V, V
IN
or V
OUT
4.5V
--
--
100
A
Parameters Description
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Units
V
OH
Output HIGH Voltage
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OH
= 24.0mA
2.4
3.3
V
V
OL
Output LOW Voltage
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OL
= 24mA
0.3
0.55
V
I
ODL
Output LOW Current
V
CC
= 5V, V
IN
= V
IH
OR
V
IL
, V
OUT
= 1.5V
(3)
60
115
150
mA
I
ODH
Output HIGH Current
V
CC
= 5V, V
IN
= V
IH
OR
V
IL
, V
OUT
= 1.5V
(3)
60
115
150
mA
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at Vcc = 5.0V, +25C ambient and maximum loading.
3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
4. This parameter is determined by device characterization but is not production tested.
Capacitance
(T
A
= 25C, f = 1 MHz)
Parameters
(4)
Description
Test Conditions
Typ.
Max.
Units
C
IN
Input Capacitance
V
IN
= 0V
4.5
6
pF
C
OUT
Output Capacitance
V
OUT
= 0V
5.5
8
pF
PI74FCT16245T Output Drive Characteristics
(Over the Operating Range)
PI74FCT162245T/162H245T Output Drive Characteristics
(Over the Operating Range)
PI74FCT16245T/162245T/162H245T
Fast CMOS 16-Bit Bidirectional Tranceivers
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PS2032D 05/17/99
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Power Supply Characteristics
Parameters Description
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Units
I
CC
Quiescent Power
V
CC
= Max.
V
IN
= GND or V
CC
0.1
500
A
Supply Current
I
CC
Supply Current per
V
CC
= Max.
V
IN
= 3.4V
(3)
0.5
1.5
mA
Input @ TTL HIGH
I
CCD
Supply Current per
V
CC
= Max.,
V
IN
= V
CC
60
100
A/
Input per MHz
(4)
Outputs Open
V
IN
= GND
MHz
X
OE = xDIR = GND
One Bit Toggling
50% Duty Cycle
I
C
Total Power Supply
V
CC
= Max.,
V
IN
= V
CC
0.7
2.5
(5)
mA
Current
(6)
Outputs Open
V
IN
= GND
f
I
= 10 MH
Z
50% Duty Cycle
X
OE = xDIR = GND
One Bit Toggling
V
IN
= 3.4V
0.9
3.3
(5)
V
IN
= GND
V
CC
= Max.,
V
IN
= V
CC
2.5
5.5
(5)
Outputs Open
V
IN
= GND
f
I
= 2.5 MH
Z
50% Duty Cycle
X
OE = xDIR = GND
16 Bits Toggling
V
IN
= 3.4V
6.5
17.5
(5)
V
IN
= GND
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at Vcc = 5.0V, +25C ambient.
3. Per TTL driven input (V
IN
= 3.4V); all other inputs at Vcc or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
5. Values for these conditions are examples of the Icc formula. These limits are guaranteed but not tested.
6. I
C
=I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+
I
CC
D
H
N
T
+ I
CCD
(f
CP
/2 + f
I
N
I
)
I
CC
= Quiescent Current
I
CC
= Power Supply Current for a TTL High Input (V
IN
= 3.4V)
D
H
= Duty Cycle for TTL Inputs High
N
T
= Number of TTL Inputs at D
H
I
CCD
= Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
f
CP
= Clock Frequency for Register Devices (Zero for Non-Register Devices)
f
I
= Input Frequency
N
I
= Number of Inputs at f
I
All currents are in milliamps and all frequencies are in megahertz.
PI74FCT16245T/162245T/162H245T
Fast CMOS 16-Bit Bidirectional Tranceivers
6
PS2032D 05/17/99
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Notes:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. This parameter is guaranteed but not production tested.
4. Skew between any two outputs, of the same package, switching in the same direction.
This parameter is guaranteed by design.
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
16245T
16245AT
16245CT
16245DT
16245ET
Com.
Com.
Com.
Com.
Com.
Parameters
Description
Conditions
(1)
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Units
t
PLH
Propagation Delay
(2)
C
L
= 50pF
1.5
7.0
1.5
4.6
1.5
4.1
1.5
3.8
1.5
3.2
ns
t
PHL
A
TO
B, B
TO
A
R
L
= 500
t
PZH
Output Enable Time
1.5
9.5
1.5
6.2
1.5
5.8
1.5
5.0
1.5
4.4
ns
t
PZL
X
OE to A
OR
B
t
PHZ
Output Disable Time
(3)
1.5
7.5
1.5
5.0
1.5
4.8
1.5
4.3
1.5
4.0
ns
t
PLZ
X
OE to A
OR
B
t
PZH
Output Enable Time
1.5
9.5
1.5
6.2
1.5
5.8
1.5
5.0
1.5
4.8
ns
t
PZL
X
DIR to A
OR
B
(3)
t
PHZ
Output Disable Time
1.5
7.5
1.5
5.0
1.5
4.8
1.5
4.3
1.5
4.0
ns
t
PLZ
X
DIR to A
OR
B
(3)
t
SK
(o)
Output Skew
(4)
--
0.5
--
0.5
--
0.5
--
0.5
--
0.5
ns
162245T
162245AT
162245CT
162245DT
162245ET
Com.
Com.
Com.
Com.
Com.
Parameters
Description
Conditions
(1)
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Units
t
PLH
Propagation Delay
(2)
C
L
= 50pF
1.5
7.0
1.5
4.6
1.5
4.1
1.5
3.8
1.5
3.2
ns
t
PHL
A
TO
B, B
TO
A
R
L
= 500
t
PZH
Output Enable Time
1.5
9.5
1.5
6.2
1.5
5.8
1.5
5.0
1.5
4.4
ns
t
PZL
X
OE to A
OR
B
t
PHZ
Output Disable Time
(3)
1.5
7.5
1.5
5.0
1.5
4.8
1.5
4.3
1.5
4.0
ns
t
PLZ
X
OE to A
OR
B
t
PZH
Output Enable Time
1.5
9.5
1.5
6.2
1.5
5.8
1.5
5.0
1.5
4.8
ns
t
PZL
X
DIR to A
OR
B
(3)
t
PHZ
Output Disable Time
1.5
7.5
1.5
5.0
1.5
4.8
1.5
4.3
1.5
4.0
ns
t
PLZ
X
DIR to A
OR
B
(3)
t
SK
(o)
Output Skew
(4)
--
0.5
--
0.5
--
0.5
--
0.5
--
0.5
ns
162245T
162245AT
162245CT
162245DT
162245ET
Com.
Com.
Com.
Com.
Com.
Parameters
Description
Conditions
(1)
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Units
t
PLH
Propagation Delay
(2)
C
L
= 50pF
1.5
7.0
1.5
4.6
1.5
4.1
1.5
3.8
1.5
3.2
ns
t
PHL
A
TO
B, B
TO
A
R
L
= 500
t
PZH
Output Enable Time
1.5
9.5
1.5
6.2
1.5
5.8
1.5
5.0
1.5
4.4
ns
t
PZL
X
OE to A
OR
B
t
PHZ
Output Disable Time
(3)
1.5
7.5
1.5
5.0
1.5
4.8
1.5
4.3
1.5
4.0
ns
t
PLZ
X
OE to A
OR
B
t
PZH
Output Enable Time
1.5
9.5
1.5
6.2
1.5
5.8
1.5
5.0
1.5
4.8
ns
t
PZL
X
DIR to A
OR
B
(3)
t
PHZ
Output Disable Time
1.5
7.5
1.5
5.0
1.5
4.8
1.5
4.3
1.5
4.0
ns
t
PLZ
X
DIR to A
OR
B
(3)
t
SK
(o)
Output Skew
(4)
--
0.5
--
0.5
--
0.5
--
0.5
--
0.5
ns
PI74FCT16245T Switching Characteristics over Operating Range
PI74FCT162245T Switching Characteristics over Operating Range
PI74FCT162H245T Switching Characteristics over Operating Range
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