TM124GU8A Datasheet, PDF (1/9 Pages) Texas Instruments – 1 048 576-WORD BY 8-BIT DYNAMIC RANDOM-ACCESS MEMORY MODULE

TM124GU8A
1 048 576-WORD BY 8-BIT DYNAMIC RANDOM-ACCESS MEMORY MODULE
• Organization . . . 1 048 576 × 8
• Single 5-V Power Supply (±10% Tolerance)
• 30-Pin Single In-Line Memory Module
(SIMM)
• TM124GU8A Utilizes Two 4-Megabit
Dynamic RAMs in Plastic Small-Outline
J-Lead Packages (SOJs)
• Long Refresh Period
. . . 16 ms (1024 Cycles)
• All Inputs, Outputs, Clocks Fully TTL
Compatible
• 3-State Outputs
• Performance Ranges:
ACCESS ACCESS READ
TIME
TIME
OR
(tRAC)
(tAA)
WRITE
CYCLE
(MAX)
(MAX) (MIN)
TM124GU8A-60
60 ns
30 ns 110 ns
TM124GU8A-70
70 ns
35 ns 130 ns
TM124GU8A-80
80 ns
40 ns 150 ns
• Low Power Dissipation
• Operating Free-Air Temperature Range
0°C to 70°C
description
The TM124GU8A is a dynamic random-access
memory module organized as 1 048 576 × 8 in a
30-pin leadless single in-line memory module
(SIMM).
SMMS181A–JANUARY 1991–REVISED JANUARY 1993
SINGLE IN-LINE
MODULE
(TOP VIEW)
VCC ₁
CAS 2
DQ1 3
A0 4
A1 5
DQ2 6
A2 7
A3 8
VSS 9
DQ3 10
A4 11
A5 12
DQ4 13
A6 14
A7 15
DQ5 16
A8 17
A9 18
NC 19
DQ6 20
W 21
VSS 22
DQ7 23
NC 24
DQ8 25
NC 26
RAS 27
NC 28
NC 29
VCC 30
The TM124GU8A is composed of two TMS44400,
1 048 576 × 4 bit dynamic RAMs in 20/26-lead
plastic small-outline J-lead packages (SOJs).
The TM124GU8A is mounted on a substrate with
decoupling capacitors. The onboard capacitors
eliminate the need for bypassing on the
motherboard and offer superior performance over
equivalent leaded capacitors due to reduced lead
inductance. With the elimination of bypass
capacitors on the motherboard, reduced PC
board size, and fewer plated through-holes, a cost
savings can be realized.
PIN NOMENCLATURE
A0–A9
CAS
DQ1–DQ8
NC
RAS
VCC
VSS
Address Inputs
Column-Address Strobe
Data In/Data Out
No Internal Connect
Row-Address Strobe
5-V Supply
Ground
The TM124GU8A features RAS access times of 60 ns, 70 ns, and 80 ns. All inputs and outputs, including clocks,
are compatible with Series 74 TTL. All address lines and data in are latched on-chip to simplify system design.
Data out is unlatched to allow greater system flexibility.
The TM124GU8A is characterized for operation from 0°C to 70°C.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
• POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
Copyright © 1993, Texas Instruments Incorporated
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