SMJ44C256 Datasheet, PDF (1/21 Pages) Texas Instruments – 262144 BY 4-BIT DYNAMIC RANDOM-ACCESS MEMORY

D Organization . . . 262144 Words × 4 Bits
D Single 5-V Supply (10% Tolerance)
D Processed to MIL-STD-833, Class B
D Performance Ranges:
ACCESS ACCESS ACCESS READ
TIME TIME TIME OR
ta(R)
(tRAC)
(MAX)
ta(C)
(tCAC)
(MAX)
ta(CA) WRITE
(tCAA) CYCLE
(MAX) (MIN)
SMJ44C256-80 80 ns 20 ns 40 ns 150 ns
SMJ44C256-10 100 ns 25 ns 45 ns 190 ns
SMJ44C256-12 120 ns 30 ns 55 ns 220 ns
SMJ44C256-15 150 ns 40 ns 70 ns 260 ns
D Enhanced Page-Mode Operation With
CAS-Before-RAS (CBR) Refresh
D Long Refresh Period
512-Cycle Refresh in 8 ms (Max)
D All Inputs and Clocks are TTL Compatible
SMJ44C256
262144 BY 4-BIT
DYNAMIC RANDOM-ACCESS MEMORY
SGMS034C – MAY 1989 – REVISED JUNE 1995
D 3-State Unlatched Output
D Low Power Dissipation
D Packaging Offered:
– 20-Pin 300-Mil Ceramic DIP (JD Suffix)
– 20-Lead Ceramic Surface-Mount Package
(HJ Suffix)
– 20-Pin Ceramic Flat Pack (HK Suffix)
– 20-Terminal Leadless Ceramic
Surface-Mount Package (FQ Suffix)
– 20-Terminal Low-Profile Leadless
Ceramic Surface-Mount Package
(HL Suffix)
– 20-Pin Ceramic Zig Zag In-Line Package
(SV Suffix)
D Operating Free-Air Temperature Range
– 55°C to 125°C
JD PACKAGE
( TOP VIEW )
DQ1 1
DQ2 2
W3
RAS 4
TF 5
A0 6
A1 ⁷
A2 ⁸
A3 ⁹
V_CC ¹⁰
20 V_SS
19 DQ4
18 DQ3
17 _CAS
16 _G
15 _A8
14 _A7
13 _A6
12 _A5
11 _A4
HJ PACKAGE
( TOP VIEW )
DQ1 1
DQ2 2
W3
RAS 4
TF 5
26 V_SS
25 DQ4
24 DQ3
23 CAS
22 G
A0 9
A1 10
A2 11
A3 12
V_CC 13
18 A8
17 A7
16 A6
15 A5
14 A4
DQ1
DQ2
W
RAS
TF
A0
A1
A2
A3
V_CC
HK PACKAGE
( TOP VIEW )
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
V_SS
DQ4
DQ3
CAS
G
A8
A7
A6
A5
A4
PIN NOMENCLATURE
A0 – A8
CAS
DQ1 – DQ4
G
RAS
TF
VCC
VSS
W
Address Inputs
Column Address Strobe
Data In / Data Out
Data Output Enable
Row Address Strobe
Test Function
5-V Supply
Ground
Write Enable
FQ / HL PACKAGES
( TOP VIEW )
DQ1 1
DQ2 2
W3
RAS 4
TF 5
26 V_SS
25 DQ4
24 DQ3
23 CAS
22 G
A0 9
A1 10
A2 11
A3 12
V_CC 13
18 A8
17 A7
16 A6
15 A5
14 A4
SV PACKAGE
( TOP VIEW )
G1
DQ3 3
V_SS 5
DQ2 7
RAS 9
A0 11
A2 ₁₃
V_{CC 15}
A5 ₁₇
A7 ₁₉
2 CAS
4 DQ4
6 DQ1
8W
10 TF
12 A1
14 A3
16 A4
18 A6
20 A8
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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.
Copyright © 1995, Texas Instruments Incorporated
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