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參數(shù)資料
| 型號(hào)： | SN54LS256 |
| 廠商： | Motorola, Inc. |
| 英文描述： | Octal Buffer/Line Driver, 3 State; Package: 20 LEAD PDIP; No of Pins: 20; Container: Rail; Qty per Container: 18 |
| 中文描述： | 雙4位可尋址鎖存 |
| 文件頁(yè)數(shù)： | 3/6頁(yè) |
| 文件大?。?/td> | 225K |
| 代理商： | SN54LS256 |
5-423
FAST AND LS TTL DATA
SN54/74LS256
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
VCC
Supply Voltage
54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
TA
Operating Ambient Temperature Range
54
74
–55
0
25
25
125
70
°
C
IOH
IOL
Output Current — High
54, 74
–0.4
mA
Output Current — Low
54
74
4.0
8.0
mA
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
(unless otherwise specified)
Symbol
Parameter
Limits
Unit
Test Conditions
Min
Typ
Max
VIH
Input HIGH Voltage
2.0
V
Guaranteed Input HIGH Voltage for
All Inputs
VIL
Input LOW Voltage
54
0.7
V
Guaranteed Input LOW Voltage for
All Inputs
74
0.8
VIK
Input Clamp Diode Voltage
–0.65
–1.5
V
VCC = MIN, IIN = –18 mA
VCC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
VOH
Output HIGH Voltage
54, 74
2.4
3.5
V
VOL
Output LOW Voltage
54, 74
0.25
0.4
V
IOL = 4.0 mA
VCC = VCC MIN,
per Truth Table
74
0.35
0.5
V
IOL = 8.0 mA
VIN = VIL or VIH
IIH
Input HIGH Current
Others
E Input
20
40
μ
A
VCC = MAX, VIN = 2.7 V
Others
E Input
0.1
0.2
mA
VCC = MAX, VIN = 7.0 V
IIL
Input LOW Current
Others
E Input
–0.4
–0.8
mA
VCC = MAX, VIN = 0.4 V
IOS
ICC
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
Short Circuit Current (Note 1)
–20
–100
mA
VCC = MAX
VCC = MAX
Power Supply Current
30
mA
AC CHARACTERISTICS
(TA = 25
°
C)
Symbol
Parameter
Limits
Unit
Test Conditions
Min
Typ
Max
tPLH
tPHL
Turn-Off Delay, Enable to Output
Turn-On Delay, Enable to Output
20
16
27
24
ns
ns
Figure 1
CL = 15 pF
tPLH
tPHL
Turn-Off Delay, Data to Output
Turn-On Delay, Data to Output
20
13
30
20
ns
ns
Figure 2
VCC = 5.0 V,
tPLH
tPHL
Turn-Off Delay, Address to Output
Turn-On Delay, Address to Output
20
14
30
24
ns
ns
Figure 3
tPHL
Turn-On Delay, Clear to Output
12
23
ns
Figure 5
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