RTM870T-691

General Description RTM870T-691 is a TSSOP56 low power main clock for ATI RS600 system using AMD K8 processors & SB600 Southbridge Output Features: z 3 – REF clock z 2 – USB 48MHz clock z 1 – Hyper Transport 66MHz clock seed z 6 – 0.8V push-pull differential SRCCLK pairs z 2 – 0.8V push-pull differential ATIGCLK pairs z 2– 3.3V push-pull differential CPUCLK pairs AC Specifications: z CPUCLK outputs Cycle-to-Cycle jitter < 100ps z SRCCLK outputs Cycle-to-Cycle jitter < 125ps z ATIGCLK outputs Cycle-to-Cycle jitter < 125ps z REF outputs Cycle-to-Cycle jitter < 200ps z HTT outputs Cycle-to-Cycle jitter < 180ps z 48MHz USB outputs Cycle-to-Cycle jitter < 130ps z +/- 300ppm Frequency accuracy on CPU, SRC, ATIG clocks RTM870T-691 GNDREF 1 VDDREF 2 X1 3 X2 4 VDD48 5 **Mode/48MHz_0 6 **Sync/48MHz_1 7 GND48 8 SCLK 9 SDAT 10 *RESET# 11 SRCCLK_7 12 SRCCLK_7# 13 VDDSRC 14 GNDSRC 15 SRCCLK_6 16 SRCCLK_6# 17 SRCCLK_5 18 SRCCLK_5# 19 SRCCLK_4 20 SRCCLK_4# 21 GNDSRC 22 VDDSRC 23 SRCCLK_2 24 SRCCLK_2# 25 VDDSRC 26 GNDSRC 27 *CLKREQB# 28 RTM870T-691 56 *FSA/REF_0 55 *FSB/REF_1 54 *FSC/REF_2 53 NC 52 VDDHTT 51 HTTCLK_0 50 GNDHTT 49 *CLKREQA# 48 CPUCLK8_0 47 CPUCLK8_0# 46 VDDCPU 45 GNDCPU 44 CPUCLK8_1 43 CPUCLK8_1# 42 VDDA 41 GNDA 40 IREF (**Turbo) 39 SRCCLK_0 38 SRCCLK_0# 37 GNDSRC 36 VDDSRC 35 ATIGCLK_0 34 ATIGCLK_0# 33 VDDATIG 32 GNDATIG 31 ATIGCLK_1 30 ATIGCLK_1# 29 *CLKREQC# Option Function Mode(PIN6) PIN40 0 NC 1 Turbo Application Features: z 3 – Clock Request pins for SRC and ATIG c...