tc74hc697af TOSHIBA Semiconductor CORPORATION, tc74hc697af Datasheet - Page 3

• Manufacturer Part Number: tc74hc697af
• Description: Synchronous Presettable 4-bit Binary Up/down Counter With Output Register
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Truth Table
X: Don’t care
Z: High impedance
a~d: The level of steady state inputs at inputs A through D respectively.
a’~d’: The level of steady state outputs at internal counter outputs QA’ through QD’ respectively.
RCO = (
CCLR
X
H
H
H
H
H
H
X
X
L
UP
⋅
LOAD
QA
H
H
H
H
X
X
X
X
X
L
⋅
QB
⋅
ENP
QC
H
X
X
X
X
L
L
X
X
X
⋅
QD
ENT
⋅
H
X
X
X
X
X
X
X
L
L
ENT
Inputs
+
CCK
UP
X
X
X
X
⋅
QA
U/
X
X
X
X
X
H
X
X
X
L
⋅
D
QB
⋅
RCK
QC
X
X
X
X
X
X
X
X
⋅
QD
3
R/
⋅
H
X
H
L
L
L
L
L
L
L
ENT
C
)
G
H
L
L
L
L
L
L
L
L
L
QA
a’
Z
L
a
Count Down
QB
No Change
No Change
No Change
b’
Z
L
b
Count Up
Outputs
QC
Z
c’
TC74HC697AP/AF
L
c
QD
d’
Z
L
d
Clear Counter
Load Register
Load Counter
2007-10-01
No Count
No Count
No Count
Function
Count
Count
Z