Part Number: RTM870T-691
Function: Low Power Main Clock
Package: TSSOP 56 Type
Manufacturer: RealTek
Image and pinouts :
Description
The RTM870T-691 is a TSSOP56 low power main clock for ATI RS600 system using AMD K8 processors & SB600 Southbridge.
Output
Features
1. 3 – REF clock
2. 2 – USB 48MHz clock
3. 1 – Hyper Transport 66MHz clock seed
4. 6 – 0.8V push-pull differential SRCCLK pairs
5. 2 – 0.8V push-pull differential ATIGCLK pairs
6. 2– 3.3V push-pull differential CPUCLK pairs
AC Specifications:
1. CPUCLK outputs Cycle-to-Cycle jitter < 100ps
2. SRCCLK outputs Cycle-to-Cycle jitter < 125ps
3. ATIGCLK outputs Cycle-to-Cycle jitter < 125ps
4. REF outputs Cycle-to-Cycle jitter < 200ps
5. HTT outputs Cycle-to-Cycle jitter < 180ps
6. 48MHz USB outputs Cycle-to-Cycle jitter < 130ps
7. +/- 300ppm Frequency accuracy on CPU, SRC, ATIG clocks
Application
Features
1. 3 – Clock Request pins for SRC and ATIG clocks
2. Spread Spectrum for EMI reduction
3. Outputs controllable by SMBus
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