參數(shù)資料
型號: 74F779
廠商: NXP Semiconductors N.V.
元件分類: 通用總線功能
英文描述: 8-bit bidirectional binary counter (3-State)(8位雙向二進(jìn)制計數(shù)器(三態(tài)))
中文描述: 8位雙向二進(jìn)制計數(shù)器(3態(tài))(8位雙向二進(jìn)制計數(shù)器(三態(tài)))
文件頁數(shù): 8/12頁
文件大小: 100K
代理商: 74F779
Philips Semiconductors
Product specification
74F779
8-bit bidirectional binary counter (3-State)
1989 Sep 20
8
TEST CIRCUIT AND WAVEFORMS
t
w
90%
V
M
10%
90%
V
M
10%
90%
V
M
10%
90%
V
M
10%
NEGATIVE
PULSE
POSITIVE
PULSE
t
w
AMP (V)
0V
0V
t
THL (
t
f
)
INPUT PULSE REQUIREMENTS
rep. rate
t
w
t
TLH
t
THL
1MHz
500ns
2.5ns
2.5ns
Input Pulse Definition
V
CC
family
74F
D.U.T.
PULSE
GENERATOR
R
L
C
L
R
T
V
IN
V
OUT
Test Circuit for 3-State Outputs
DEFINITIONS:
R
L
=
Load resistor;
see AC electrical characteristics for value.
Load capacitance includes jig and probe capacitance;
see AC electrical characteristics for value.
Termination resistance should be equal to Z
OUT
of
pulse generators.
C
L
=
R
T
=
t
THL (
t
f
)
t
TLH (
t
r
)
t
TLH (
t
r
)
AMP (V)
amplitude
3.0V
1.5V
V
M
R
L
7.0V
SF00777
TEST
t
PLZ
t
PZL
All other
SWITCH
closed
closed
open
SWITCH POSITION
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