參數(shù)資料
型號(hào)： SMJ44C256
廠商： Texas Instruments, Inc.
英文描述： 262144 BY 4-BIT DYNAMIC RANDOM-ACCESS MEMORY
中文描述： 262144 4位動(dòng)態(tài)隨機(jī)存取存儲(chǔ)器
文件頁(yè)數(shù)： 5/21頁(yè)
文件大?。?/td> 323K
代理商： SMJ44C256
SMJ44C256
262144 BY 4-BIT
DYNAMIC RANDOM-ACCESS MEMORY
SGMS034C – MAY 1989 – REVISED JUNE 1995
5
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
power up
To achieve proper device operation, an initial pause of 200
μ
s followed by a minimum of eight initialization
(refresh) cycles is required after power-up to the full V
CC
level.
test function pin
During normal device operation the TF pin must either be disconnected or biased at a voltage less than or equal
to V
CC
.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range on any pin (see Note 1)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Short-circuit output current
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total power dissipation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0 V to 7 V
– 1 V to 7 V
50 mA
1 W
– 55
°
C to 125
°
C
– 65
°
C to 150
°
C
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: All voltage values are with respect to VSS.
recommended operating conditions
MIN
NOM
MAX
UNIT
VCC
VSS
VIH
VIL
TA
Supply voltage
4.5
5
5.5
V
Supply voltage
0
V
High-level input voltage
2.4
6.5
V
Low-level input voltage (see Note 2)
– 1
0.8
V
°
C
°
C
Operating free-air temperature
– 55
TC
NOTE 2: The algebraic convention, where the more negative (less positive) limit is designated as minimum, is used for logic-voltage levels only.
Case temperature
125
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