W85C178 Datasheet PDF – Real Time Clock IC

Part Number : W85C178

Function : Real Time Clock With 128-Byte RAM

Package : DIP 24P

Manufacturers : Winbond


W85C178 Real Time Clock

Description :

The Real Time Clock with 128-byte RAM is a peripheral device for use with various microprocessors. The W85C178 is designed to be a direct replacement for the MC146818A. The device’s function include a time-of-day clock, an alarm, a one-hundred-year calendar, a square wave generator, programmable interrupts, and 114 bytes of nonvolatile static RAM. The device uses CMOS technology and interfaces with most microprocessor buses. The device consumes very little power.

Pinouts :

W85C178 datasheet


1. 14 bytes of clock and control / status registers
2. 128 bytes of general nonvolatile storage
3. BCD or binary representation of time, calendar, and alarm registers
4. Counts seconds, minutes, hours, days of the week, days of the month, momths, years
5. 12-hour to 24-hour clock with AM and PM in 12-hour mode
6. Daylight saving time option
7. Automatic leap-year adjustment
8. Programmable square wave output signal
7. Time base input option : 4.194304 MHz, 1.048576 MHz, 32.768 kHz
8. Automatic end of month recognition


Other data sheets within the file : MC146818A, 85C178

W85C178 Datasheet PDF Download

W85C178 pdf

5P49V5901 Datasheet PDF – Programmable Clock Generator

Part Number : 5P49V5901

Function : Power Programmable Clock Generator

Package : 24-pin VFQFPN

Manufacturers : Integrated Device Technology

Pinouts :

5P49V5901 datasheet


Description :

The IDT5P49V5901 is low-power programmable clock generator with best-in-class jitter performance and design flexibility with universal outputs capable of generating any output frequency. IDT5P49V5901 is intended for high performance consumer, networking, industrial, computing, and data-communications applications. Configurations may be stored in on-chip One-Time Programmable (OTP) memory or changed using I2C interface. This is IDTs fifth generation of programmable clock technology (VersaClock 5).The frequencies are generated from a single reference clock or crystal input. A glitchless manual switchover function allows one of the redundant clock inputs to be selected during normal operation.


1. Generates up to four independent output frequencies
2. Four fractional output dividers (FODs)
3. Independent Spread Spectrum capability on each output pair
4. Four banks of internal non-volatile in-system programmable or factory programmable OTP memory
5. I2C serial programming interface
6. One reference LVCMOS output clock
7. Redundant clock inputs with manual switchover
8. Programmable loop bandwidth


1. Ethernet switch/router
2. PCI Express 1.0/2.0/3.0
3. Broadcast video/audio timing
4. Multi-function printer
5. Processor and FPGA clocking
6. Any-frequency clock conversion
8. Fiber Channel, SAN
9. Telecom line cards

Other data sheets within the file : 5901B, 5P49V5901AdddNLGI, 5P49V5901AdddNLGI8

5P49V5901 Datasheet PDF Download

5P49V5901 pdf