Part Number : 74AC191SCX
Function : Up/Down Counter with Preset and Ripple Clock
Package : DIP, SOP 16 Pin type
Maker : Fairchild Semiconductor
Pinouts : 
Description :
The 74AC191SCX, 74AC191 is a reversible modulo 16 binary counter. It features synchronous counting and asynchronous presetting. The preset feature allows the AC191 to be used in programmable dividers.
Features
1. ICC reduced by 50%
2. High speed—133 MHz typical count frequency
3. Synchronous counting
4. Asynchronous parallel load
5. Cascadable
6. Outputs source/sink 24 mA
Datasheet PDF Download : 
Others datasheet of same file :
74AC191CW, 74AC191MTC, 74AC191MTCX, 74AC191PC, 74AC191SC, 74AC191