參數(shù)資料
型號(hào): 74F169SC
廠商: FAIRCHILD SEMICONDUCTOR CORP
元件分類: 通用總線功能
英文描述: 4-Stage Synchronous Bidirectional Counter
中文描述: F/FAST SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDSO16
封裝: 0.150 INCH, MS-012, SOIC-16
文件頁(yè)數(shù): 9/12頁(yè)
文件大?。?/td> 116K
代理商: 74F169SC
Philips Semiconductors
Product specification
74F169
4-bit up/down binary synchronous counter
1996 Jan 05
9
TIMING DIAGRAM (Typical Load, Count, and Inhibit Sequences)
}
LOAD
7
8
9
0
1
2
2
1
0
9
8
7
COUNT UP
COUNT DOWN
INHIBIT
PE
TC
CEP and CET
U/D
D
0
D
1
D
2
D
3
Q
0
Q
1
Q
2
Q
3
CP
2
SEQUENCE
SF00797
NOTES:
The operation of the 74F169 is similar to the Illustration above.
1. Load (preset) to BCD seven
2. Count up to eight, nine (maximum), zero, one, and two
3. Inhibit
4. Count down to one, zero (minimum), nine, eight, and seven
TEST CIRCUIT AND WAVEFORM
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
2.5ns
t
THL
2.5ns
1MHz
500ns
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 Totem-Pole 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
SF00006
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