74LVC169 Philips, 74LVC169 Datasheet - Page 4

• Manufacturer Part Number: 74LVC169
• Description: Presettable synchronous 4-bit up/down binary counter
• Manufacturer: Philips

Philips Semiconductors
STATE DIAGRAM
FUNCTION TABLE
H = High voltage level steady state
h = High voltage level one setup time prior to the Low-to-High
L = Low voltage level steady state
l
q = Lower case letters indicate the state of the referenced output
X = Don’t care
* = The TC is Low when CET is Low and the counter is at
1998 May 20
OPERATING
Parallel load
(Dn Qn)
Count Up
(increment)
Count Down
(decrement)
Hold
(do nothing)
Presettable synchronous 4-bit up/down
binary counter
= Low voltage level one setup time prior to the Low-to-High
= Low-to-High clock transition
MODES
clock transition
clock transition
prior to the Low-to-High clock transition
Terminal Count.
Terminal Count Up is (HHHH) and Terminal Count Down is
(LLLL).
CP
15
14
13
12
0
U/D
X
X
X
X
h
l
11
1
CEP
INPUTS
X
X
X
h
l
l
10
2
COUNT DOWN
COUNT UP
CET
X
X
X
X
l
l
3
9
PE
X
h
h
h
h
l
4
5
6
7
8
D
X
X
X
X
X
l
n
Count
Count
Down
OUTPUTS
Q
Up
q
q
H
L
n
n
n
SF00788
TC
H
*
*
*
*
*
4
TYPICAL TIMING SEQUENCE
Typical timing sequence: reset outputs to zero; preset to binary
twelve; count to thirteen, fourteen, fifteen, zero, one, and two;
inhibit
CEP
CET
MR
CP
PE
D0
D1
D2
D3
Q0
Q1
Q2
Q3
TC
RESET PRESET
12
13
14
15
COUNT
0
1
2
74LVC169
Product specification
INHIBIT
SY00069