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参数资料
| 型号： | SN74AS867DWR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 计数器 |
| 英文描述： | AS SERIES, SYN POSITIVE EDGE TRIGGERED 8-BIT BIDIRECTIONAL BINARY COUNTER, PDSO24 |
| 封装： | PLASTIC, SO-24 |
| 文件页数： | 5/24页 |
| 文件大小： | 508K |
| 代理商： | SN74AS867DWR |
SN54AS867, SN54AS869
SN74ALS867A, SN74ALS869, SN74AS867, SN74AS869
SYNCHRONOUS 8-BIT UP/DOWN COUNTERS
SDAS115C – DECEMBER 1982 – REVISED JANUARY 1995
13
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54AS867
SN74AS867
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
VIK
VCC = 4.5 V,
II = –18 mA
–1.2
V
VOH
VCC = 4.5 V to 5.5 V,
IOH = – 2 mA
VCC –2
V
VOL
RCO
VCC = 4.5 V
IOL = 20 mA,
VIL on ENT = 0.7 V
0.34
0.5
V
OL
Other outputs
CC
IOL = 20 mA
0.34
0.5
II
VCC = 5.5 V,
VI = 7 V
0.1
mA
IIH
ENT
VCC =5 5V
VI =2 7V
40
A
IIH
Other inputs
VCC = 5.5 V,
VI = 2.7 V
20
A
IIL
ENT
VCC =5 5V
VI =0 4V
–4
mA
IIL
Other inputs
VCC = 5.5 V,
VI = 0.4 V
–2
mA
IO
VCC = 5.5 V,
VO = 2.25 V
–30
–112
–30
–112
mA
ICC
VCC = 5.5 V
134
195
134
195
mA
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.
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500 ,
TA = MIN to MAX§
UNIT
(INPUT)
(OUTPUT)
SN54AS867
SN74AS867
MIN
MAX
MIN
MAX
fmax*
40
50
MHz
tPLH
CLK
RCO
5
31
5
22
ns
tPHL
CLK
RCO
6
19
6
16
ns
tPLH
CLK
Any Q
3
12
3
11
ns
tPHL
CLK
Any Q
4
16
4
15
ns
tPLH
ENT
RCO
3
19
3
10
ns
tPHL
ENT
RCO
5
21
5
17
ns
tPLH
ENP
RCO
5
16
5
14
ns
tPHL
ENP
RCO
5
21
5
17
ns
tPHL
Clear (S0 or S1 low)
Any Q
7
23
7
21
ns
* On products compliant to MIL-STD-883, Class B, this parameter is based on characterization data but is not production tested.
§ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
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