Static RAM. HM621100A Datasheet

HM621100A RAM. Datasheet pdf. Equivalent

HM621100A Datasheet
Recommendation HM621100A Datasheet
Part HM621100A
Description 1048576 word / 1 Bit High Speed CMOS Static RAM
Feature HM621100A; HM621100A Series 1048576-word × 1-bit High Speed CMOS Static RAM Rev. 0.0 Dec. 1, 1995 Description .
Manufacture Hitachi
Datasheet
Download HM621100A Datasheet





Hitachi HM621100A
HM621100A Series
1048576-word × 1-bit High Speed CMOS Static RAM
Rev. 0.0
Dec. 1, 1995
Description
The Hitachi HM621100A is a high speed 1M Static RAM organized as 1048576-word × 1-
bit. It realizes high speed access time (20/25/35 ns) and low power consumption, employing
CMOS process technology and high speed circuit designing technology. It is most
advantageous for the field where high speed and high density memory is required, such as
the cache memory for main frame or 32-bit MPU. The HM621100A, packaged in a 400-mil
plastic SOJ is available for high density mounting.
Features
• Single 5 V supply and high density 28-pin package (DIP and SOJ)
• High speed
Access time: 20/25/35 ns (max)
• Low power dissipation
Active mode: 350 mW (typ)
Standby mode: 100 µW (typ)
• Completely static memory required
No clock or timing strobe required
• Equal access and cycle time
• DirectlyTTLcompatible
All inputs and outputs
Ordering Information
Type No.
Access Time Package
HM621100AP-20
HM621100AP-25
HM621100AP-35
20 ns
25 ns
35 ns
400-mil 28-pin plastic DIP (DP-28C)
HM621100ALP-20
HM621100ALP-25
HM621100ALP-35
20 ns
25 ns
35 ns
HM621100AJP-20
HM621100AJP-25
HM621100AJP-35
20 ns
25 ns
35 ns
400-mil 28-pin plastic SOJ (CP-28D)
HM621100ALJP-20 20 ns
HM621100ALJP-25 25 ns
HM621100ALJP-35 35 ns



Hitachi HM621100A
HM621100A Series
Pin Arrangement
A0 1
A1 2
A2 3
A3 4
A4 5
A5 6
NC 7
A6 8
A7 9
A8 10
A9 11
Q 12
WE 13
VSS 14
28 VCC
27 A19
26 A18
25 A17
24 A16
23 A15
22 A14
21 NC
20 A13
19 A12
18 A11
17 A10
16 D
15 CS
(Top view)
Pin Description
Pin Name
A0 – A19
D
Q
CS
WE
VCC
VSS
Function
Address
Input
Output
Chip select
Write enable
Power supply
Ground
2



Hitachi HM621100A
Block Diagram
A1
A2
A3
A4
A5
A6
A7
A8
A9
Din
Row
decoder
HM621100A Series
Memory array
512 × 2048
VCC
VSS
Column I/O
Column decoder
Dout
CS A19 A18 A17 A16A15 A14 A13 A12 A11 AA010
WE
3





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