TC74AC161 View Datasheet(PDF) - Toshiba
Part Name
Description
MFG CO.
TC74AC161 Datasheet PDF : 15 Pages
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Pin Assignment
TC74AC161,163P/F/FN/FT
CLR 1
CK 2
A3
B4
C5
D6
ENP 7
GND 8
(top view)
IEC Logic Symbol
16 VCC
15 Carry Output
14 QA
13 QB
12 QC
11 QD
10 ENT
9 LOAD
CLR (1)
LOAD (9)
ENT (10)
ENP (7)
CK (2)
TC74AC161
CTRDIV 16
CT = 0
M1
M2
G3 3CT = 15
G4
C5/2, 3, 4+
A (3) 1, 5D (1)
B (4)
(2)
C (5)
(4)
D (6)
(8)
(15) Carry Output
(14) QA
(13) QB
(12) QC
(11) QD
CLR
(1)
LOAD (9)
ENT (10)
ENP (7)
CK (2)
TC74AC163
CTRDIV 16
5CT = 0
M1
M2
G3 3CT = 15
G4
C5/2, 3, 4+
A (3) 1, 5D (1)
B (4)
(2)
C (5)
(4)
D (6)
(8)
(15) Carry Output
(14) QA
(13) QB
(12) QC
(11) QD
Truth Table (Note)
Inputs
CLR
(161)
CLR
(163)
LOAD
ENP
ENT
CK
(161)
CK
(163)
QA
L
L
X
X
X
X
L
H
H
L
X
X
A
H
H
H
X
L
H
H
H
L
X
H
H
H
H
H
H
X
X
X
X
Outputs
QB QC
L
L
B
C
No Change
No Change
Count Up
No Change
Function
QD
L Reset to “0”
D Preset Data
No Count
No Count
Count
No Count
Note:
X: Don’t care
A, B, C, D: Logic level of data inputs
Carry: Carry = ENT·QA·QB·QC·QD
2
2007-10-01
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