HM514400B/BL Series
HM514400C/CL Series
1,048,576-word
4-bit Dynamic Random Access Memory
Rev. 1.0
Nov. 29, 1994
The Hitachi HM514400B/BL, HM514400C/CL
are CMOS dynamic RAM organized 1,048,576-
word
4-bit. HM514400B/BL, HM514400C/CL
have realized higher density, higher performance
and various functions by employing 0.8
m CMOS
process technology and some new CMOS circuit
design technologies. The HM514400B/BL,
HM514400C/CL offer Fast Page Mode as a high
speed access mode. Multiplexed address input
permits the HM514400B/BL, HM514400C/CL to
be packaged in standard 300-mil 26-pin plastic
SOJ, standard 400-mil 20-pin plastic ZIP and 26-
pin plastic TSOP II.
Features
Single 5 V (
10%)
High speed
-- Access time
60 ns/70 ns/80 ns (max)
Low power dissipation
-- Active mode
605 mW/550 mW/495 mW (max)
-- Standby mode 11 mW (max)
0.55 mW (max) (L-version)
Fast page mode capability
1024 refresh cycles : 16 ms
1024 refresh cycles : 128 ms (L-version)
3 variations of refresh
--
RAS-only refresh
--
CAS-before-RAS refresh
-- Hidden refresh
Test function
Battery back up operation
-- HM514400BL Series (L-version)
-- HM514400CL Series (L-version)
ADE-203-269A (Z)
Block Diagram
5
HM514400B/BL, HM514400C/CL Series
256 k Memory Array Mat
I/O Bus & Column Decoder
256 k Memory Array Mat
256 k Memory Array Mat
256 k Memory Array Mat
256 k Memory Array Mat
256 k Memory Array Mat
256 k Memory Array Mat
256 k Memory Array Mat
I/O Bus & Column Decoder
I/O Bus & Column Decoder
I/O Bus & Column Decoder
256 k Memory Array Mat
I/O Bus & Column Decoder
256 k Memory Array Mat
256 k Memory Array Mat
256 k Memory Array Mat
256 k Memory Array Mat
256 k Memory Array Mat
256 k Memory Array Mat
256 k Memory Array Mat
I/O Bus & Column Decoder
I/O Bus & Column Decoder
I/O Bus & Column Decoder
Row
Driver
Row
Driver
Row
Driver
Row
Driver
Row
Driver
Row
Driver
Row
Driver
Row
Driver
Row Decoder & Peripheral Circuit
WE
RAS
CAS
Row
Driver
Row
Driver
Row
Driver
Row
Driver
Row
Driver
Row
Driver
Row
Driver
Row
Driver
Row Address Buffer
Column Address Buffer
Address A0A9
I/O4 Buffer
RAS Control
Circuit
CAS Control
Circuit
WE Control
Circuit
OE
OE Control
Circuit
I/O3 Buffer
I/O2 Buffer
I/O1 Buffer
I/O1
I/O2
I/O3
I/O4