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CY26501 Datasheet

  • CY26501

  • Clocks and Buffers

  • 13頁

  • ETC

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CY26501/CY26502
533-MHz Direct Rambus鈩?Clock Generator
Features
鈥?Differential clock source for Direct Rambus鈩?memory
subsystem for up to 1066-MHz data transfer rate
鈥?Provide synchronization flexibility: the Rambus
廬
Chan-
nel can optionally be synchronous to an external sys-
tem or processor clock
鈥?Power managed output allows Rambus Channel clock
to be turned off to minimize power consumption for
mobile applications
鈥?Cycle to Cycle Jitter below 50 ps
鈥?Low-power CMOS design packaged in a 24-pin, 150-mil
SSOP package
鈥?Support up to 533MHz for Commercial temperature and
400 MHz for Industrial temperature.
Overview
The Cypress CY26501 and CY26502 provide the differential
clock signals for a Direct Rambus memory subsystem. It in-
cludes signals to synchronize the Direct Rambus Channel
clock to an external system clock but can also be used in sys-
tems that do not require synchronization of the Rambus clock.
Key Specifications
Supply Voltage: ..................................... V
DD
= 3.3V鹵0.165V
Operating Temperature(Commercial): ............. 0擄C to +70擄C
Operating Temperature(Industrial): .............. -40擄C to +85擄C
Input Threshold: .................................................. 1.5V typical
Maximum Input Voltage:.........................................V
DD
+0.5V
Maximum Input Frequency: ..................................... 100 MHz
Output Duty Cycle: .................................. 40/60% worst case
Output Type:........................... Rambus signaling level (RSL)
Block Diagram
REFCLK
MULT0:1
Pin Configuration
VDDIR
REFCLK
VDD
GND
GND
PCLKM
SYNCLKN
GND
VDD
VDDIPD
STOPB
PWRDNB
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
S0
S1
VDD
GND
CLK
NC
CLKB
GND
VDD
MULT0
MULT1
GND
PLL
PCLKM
SYNCLKN
Phase
Alignment
Output
Logic
CLK
CLKB
S0:1
Test
Logic
STOPB
Direct Rambus is a trademark and Rambus is a registered trademark of Rambus Inc.
Intel is a registered trademark of Intel Corporation.
Cypress Semiconductor Corporation
Document #: 38-07356 Rev. *A
鈥?/div>
3901 North First Street
鈥?/div>
San Jose
鈥?/div>
CA 95134 鈥?408-943-2600
Revised December 26, 2002

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