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參數(shù)資料
| 型號： | 74ALS191 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 通用總線功能 |
| 英文描述： | SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS |
| 中文描述： | 同步4位向上/向下二進制計數(shù)器 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 133K |
| 代理商： | 74ALS191 |
SN54ALS191A, SN74ALS191A
SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS
SDAS210C – DECEMBER 1982 – REVISED JULY 1996
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54ALS191A
MIN
TYP
SN74ALS191A
MIN
TYP
UNIT
MAX
MAX
VIK
VOH
VCC = 4.5 V,
VCC = 4.5 V to 5.5 V,
II = –18 mA
IOH = –0.4 mA
IOL = 4 mA
IOL = 8 mA
VI = 7 V
VI = 2.7 V
–1.5
–1.5
V
VCC– 2
VCC– 2
VOL
VCC= 4 5 V
VCC = 4.5 V
0.25
0.4
0.25
0.4
V
0.35
0.5
II
IIH
VCC = 5.5 V,
VCC = 5.5 V,
0.2
0.1
mA
μ
A
20
20
IIL
CTEN or CLK
VCC= 5 5 V
VCC = 5.5 V,
VI= 0 4 V
VI = 0.4 V
–0.2
–0.2
mA
All others
–0.2
–0.1
IO
ICC
All typical values are at VCC = 5 V, TA = 25
°
C.
The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
VCC = 5.5 V,
VCC = 5.5 V,
VO = 2.25 V
All inputs at 0
–20
–112
–30
– 112
mA
12
22
12
22
mA
switching characteristics (see Figure 1)
PARAMETER
FROM
(OUTPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500
,
TA = MIN to MAX§
SN54ALS191A
MIN
MAX
UNIT
SN74ALS191A
MIN
MAX
fmax
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
20
30
MHz
LOAD
Any Q
7
37
7
30
ns
8
34
8
30
A B C D
A, B, C, D
Any Q
3
25
3
21
ns
4
25
4
21
CLK
RCO
5
24
5
20
ns
5
25
5
20
CLK
Any Q
3
26
3
18
ns
3
22
3
18
CLK
MAX/MIN
8
37
8
31
ns
8
34
8
31
D/U
RCO
8
45
8
37
ns
10
36
10
28
D/U
MAX/MIN
8
35
8
25
ns
8
30
8
25
CTEN
RCO
4
4
21
23
4
4
18
18
ns
§For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
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