RTM870T-691 – TSSOP56 low power main clock

Part Number : RTM870T-691

Function : TSSOP56 low power main clock

Manufactures : RealTek

Images :

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RTM870T-691 image

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pinout

Description :

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 clocks z Spread Spectrum for EMI reduction z Outputs controllable by SMBus SRC Output Control Control REQ# Register REQ# 0(default) 1 0 by register enable 1(default) by register disable Frequency Table FSC 0 FSB 0 FSA CPU 0 266.67 0 0 1 133.33 0 1 0 200.00 0 1 1 166.67 1 0 0 333.33 1 0 1 100.00 1 1 0 400.00 1 1 1 200.00 HTT 66.66 66.66 66.66 66.66 66.66 66.66 66.66 66.66 SRC 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00 ATIG 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00 USBI 48.00 48.00 48.00 48.00 48.00 48.00 48.00 48.00 SSC +/- 0.25% +/- 0.25% +/- 0.25% +/- 0.25% +/- 0.25% +/- 0.25% +/- 0.25% +/- 0.25% 2006/10/12 Confidential 1 v.1.4 RTM870T-691 Pin Description In order to reduce pin counts, and therefore package size and cost, some pins have multiple functions. In those cases, the functions are separated with a “/” symbol. Refer to the ‘Pin Assignment’ diagram for a graphical representation. Pin Pin Name 1 GNDREF 2 VDDREF 3 X1 4 X2 5 VDD48 6 48MHz_0 **Mode 7 48MHz_1 **Sync 8 GND48 9 SCLK 10 SDAT 11 RESET# 12 SRCCLK_7 13 SRCCLK_7# 14 VDDSRC 15 GNDSRC 16 SRCCLK_6 17 SRCCLK_6# 18 SRCCLK_5 19 SRCCLK_5# 20 SRCCLK_4 21 SRCCLK_4# 22 GNDSRC 23 VDDSRC 24 SRCCLK_2 25 SRCCLK_2# 26 VDDSRC 27 GNDSRC 28 *CLKREQ_B# Type Description G GND pin. P 3.3V power supply I Crystal Input: external 14.318MHz crystal connection. O Crystal output: external 14.318MHz crystal connection. P 3.3V power supply O 3.3V 48 [...]

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RTM870T-691 Datasheet


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