DESCRIPTION
s
475ps propagation delay
s
2.8GHz toggle frequency
s
Internal 75K
input pull-down resistors
s
Available in 8-pin SOIC package
The SY10/100EL51 are differential clock D flip-flops
with reset. These devices are functionally similar to the
E151 devices, with higher performance capabilities. With
propagation delays and output transition times
significantly faster than the E151, the EL51 is ideally
suited for those applications which require the ultimate
in AC performance.
The reset input is an asynchronous, level triggered
signal. Data enters the master portion of the flip-flop
when the clock is LOW and is transferred to the slave,
and thus the outputs, upon a positive transition of the
clock. The differential clock inputs of the EL51 allow the
device to be used as a negative edge triggered flip-flop.
The differential input employs clamp circuitry to
maintain stability under open input (pulled down to V
EE
)
conditions.
FEATURES
DIFFERENTIAL
CLOCK D FLIP-FLOP
PIN CONFIGURATION/BLOCK DIAGRAM
PIN NAMES
Pin
Function
R
Reset Input
D
Data Input
CLK
Clock Input
Q
Data Output
Rev.: E
Amendment: /0
Issue Date:
August, 1998
SY10EL51
SY100EL51
1
2
3
4
5
6
7
8
R
V
CC
Q
V
EE
D
Q
R
CLK
Flip-Flop
D
CLK
SOIC
TOP VIEW
D
R
CLK
Q
L
L
Z
L
H
L
Z
H
X
H
X
L
NOTE:
1. Z = LOW-to-HIGH transition.
TRUTH TABLE
(1)
1
2
SY10EL51
SY100EL51
Micrel
T
A =
40
C
T
A =
0
C
T
A =
+25
C
T
A =
+85
C
Symbol
Parameter
Min.
Typ.
Max.
Min.
Typ.
Max.
Min.
Typ.
Max.
Min.
Typ.
Max.
Unit
f
MAX
Maximum Toggle
1.8
2.8
--
2.2
2.8
--
2.2
2.8
--
2.2
2.8
--
GHz
Frequency
t
PLH
Propagation Delay to
ps
t
PHL
Output
CLK
325
465
605
375
465
555
385
475
565
440
530
620
R
305
455
605
355
455
555
355
465
565
410
510
620
t
S
Set-up Time
150
0
--
150
0
--
150
0
--
150
0
--
ps
t
H
Hold Time
250
100
--
250
100
--
250
100
--
250
100
--
ps
t
RR
Reset Recovery
400
200
--
400
200
--
400
200
--
400
200
--
ps
t
PW
Minimum Pulse Width
400
--
--
400
--
--
400
--
--
400
--
--
ps
CLK, Reset
V
PP
Minimum Input
150
--
--
150
--
--
150
--
--
150
--
--
mV
Swing
(1)
V
CMR
Common Mode
(2)
--
0.4
(2)
--
0.4
(2)
--
0.4
(2)
--
0.4
V
Range
(2)
t
r
Output Rise/Fall Times Q
100
225
350
100
225
350
100
225
350
100
225
350
ps
t
f
(20% to 80%)
AC ELECTRICAL CHARACTERISTICS
V
EE
= V
EE
(Min.) to V
EE
(Max.); V
CC
= GND
NOTES:
1. Minimum input swing for which AC parameters are guaranteed.
2. The CMR range is referenced to the most positive side of the differential input signal. Normal operation is obtained if the HIGH level falls within the specified
range and the peak-to-peak voltage lies between V
PP
min. and 1V. The lower end of the CMR range is dependent on V
EE
and is equal to V
EE
+ 3.0V.
PRODUCT ORDERING CODE
Ordering
Package
Operating
Code
Type
Range
SY10EL51ZC
Z8-1
Commercial
SY10EL51ZCTR
Z8-1
Commercial
SY100EL51ZC
Z8-1
Commercial
SY100EL51ZCTR
Z8-1
Commercial
DC ELECTRICAL CHARACTERISTICS
T
A =
40
C
T
A =
0
C
T
A =
+25
C
T
A =
+85
C
Symbol
Parameter
Min.
Typ.
Max.
Min.
Typ.
Max.
Min.
Typ.
Max.
Min.
Typ.
Max.
Unit
I
EE
Power Supply Current
mA
10EL
--
24
29
19
24
29
19
24
29
19
24
29
100EL
--
24
29
19
24
29
19
24
29
24
30
36
V
EE
Power Supply Voltage
V
10EL 4.75
5.2
5.5
4.75
5.2
5.5
4.75
5.2
5.5
4.75
5.2
5.5
100EL 4.20
4.5
5.5
4.20
4.5
5.5
4.20
4.5
5.5
4.20
4.5
5.5
I
IH
Input HIGH Current
--
--
150
--
--
150
--
--
150
--
--
150
A
V
EE
= V
EE
(Min.) to V
EE
(Max.); V
CC
= GND
4
SY10EL51
SY100EL51
Micrel
MICREL-SYNERGY
3250 SCOTT BOULEVARD
SANTA CLARA
CA 95054
USA
TEL
+ 1 (408) 980-9191
FAX
+ 1 (408) 914-7878
WEB
http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or
other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.
2000 Micrel Incorporated
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