SMJ44C256
262144-WORD BY 4-BIT DYNAMIC RANDOM-ACCESS MEMORY
SGMS034C – MAY 1989 – REVISED JUNE 1995
Organization . . . 262144 Words × 4 Bits
3-State Unlatched Output
Low Power Dissipation
Single 5-V Supply (10% Tolerance)
Processed to MIL-STD-833, Class B
Packaging Offered:
Performance Ranges:
– 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)
ACCESS ACCESS ACCESS READ
TIME
TIME
TIME
OR
t
t
t
a(CA)
WRITE
CYCLE
(MIN)
a(R)
a(C)
(t
RAC
)
(t
CAC
)
(t
CAA
)
(MAX)
(MAX)
(MAX)
SMJ44C256-80 80 ns
SMJ44C256-10 100 ns
SMJ44C256-12 120 ns
SMJ44C256-15 150 ns
20 ns
25 ns
30 ns
40 ns
40 ns
45 ns
55 ns
70 ns
150 ns
190 ns
220 ns
260 ns
– 20-Pin Ceramic Zig Zag In-Line Package
(SV Suffix)
Enhanced Page Mode Operation With
CAS-Before-RAS (CBR) Refresh
Operating Free-Air Temperature Range
Long Refresh Period
– 55°C to 125°C
512-Cycle Refresh in 8 ms (Max)
All Inputs and Clocks are TTL Compatible
JD PACKAGE
(TOP VIEW)
HJ PACKAGE
(TOP VIEW)
PIN NOMENCLATURE
A0–A8
CAS
Address Inputs
Column Address Strobe
Data In/Data Out
Data Output Enable
Row Address Strobe
Test Function
DQ1
DQ2
W
RAS
TF
1
2
3
4
5
26
25
24
23
22
V
SS
DQ1
DQ2
W
RAS
TF
A0
A1
A2
A3
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
SS
DQ1–DQ4
G
DQ4
DQ3
CAS
G
DQ4
DQ3
CAS
G
A8
A7
A6
A5
A4
RAS
TF
V
V
W
5-V Supply
Ground
Write Enable
CC
SS
A0
A1
A2
A3
9
18
17
16
15
14
A8
A7
A6
A5
A4
10
11
12
13
FQ/HL PACKAGES
(TOP VIEW)
SV PACKAGE
(TOP VIEW)
V
CC
V
CC
DQ1
DQ2
W
RAS
TF
1
2
3
4
5
26
25
24
23
22
V
SS
G
DQ3
1
2
4
6
8
CAS
DQ4
DQ1
W
DQ4
DQ3
CAS
G
HK PACKAGE
(TOP VIEW)
3
V
5
SS
DQ2
RAS
A0
7
V
DQ1
DQ2
W
RAS
TF
A0
A1
A2
A3
1
20
19
18
17
16
15
14
13
12
11
SS
9
10 TF
12 A1
14 A3
16 A4
18 A6
20 A8
DQ4
DQ3
CAS
G
A8
A7
A6
A5
A4
2
11
13
15
17
19
3
9
A0
A1
A2
A3
18
17
16
15
14
A8
A7
A6
A5
A4
A2
10
11
12
13
4
V
CC
A5
A7
5
6
V
7
CC
8
9
V
10
CC
EPIC is a trademark of Texas Instruments Incorporated.
Copyright 1995, Texas Instruments Incorporated
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.
1
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443