CD54HC191
description
/ordering information
The CD54/74HC190 are asynchronously presettable BCD decade counters, whereas the CD54/74HC191 and CD54/74HCT191 are asynchronously presettable binary counters.
Presetting the counter to the number on preset data inputs (A- D) is acplished by a low asynchronous parallel load (LOAD) input. Counting occurs when LOAD is high, count enable (CTEN) is low, and the down/up (D/U) input is either high for down counting or low for up counting. The counter is decremented or incremented synchronously with the low-to-high transition of the clock.
ORDERING INFORMATION
PACKAGE†
ORDERABLE PART NUMBER
TOP-SIDE MARKING
CD74HC190E
CD74HC190E
PDIP
- E
Tube of 25
CD74HC191E CD74HCT191E
CD74HC191E CD74HCT191E
Tube of 40
CD74HC191M
SOIC
- M
Reel of 2500 Reel of 250
CD74HC191M96 CD74HC191MT
HC191M
- 55°C to 125°C SOP
- NS
Tube of 40 Reel of 2000
CD74HCT191M CD74HC190NSR
HCT191M HC190M
Tube of 90
CD74HC190PW
TSSOP
- PW Reel of 2000 Reel of...
