Datasheet

74HC_HCT193 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 4 — 24 June 2013 6 of 30
NXP Semiconductors
74HC193; 74HCT193
Presettable synchronous 4-bit binary up/down counter
6. Functional description
[1] H = HIGH voltage level
L = LOW voltage level
X = don’t care
 = LOW-to-HIGH clock transition.
[2] TC
U = CPU at terminal count up (HHHH)
[3] TC
D = CPD at terminal count down (LLLL).
Table 3. Function table
[1]
Operating mode Inputs Outputs
MR PL CPU CPD D0 D1 D2 D3 Q0 Q1 Q2 Q3 TCU TCD
Reset (clear) HXXLXXXXLLLLHL
HXXHXXXXLLLLHH
Parallel load LLXLLLLLLLLLHL
LLXHLLLLLLLLHH
LLLXHHHHHHHHL H
L L HXHHHHHHHHHH
Count up L H  H X X X X count up H
[2]
H
Count down L H H  X X X X count down H H
[3]