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W48S87-04 Datasheet(PDF) 11 Page - Cypress Semiconductor

Part # W48S87-04
Description  Spread Spectrum 3 DIMM Desktop Clock
Download  21 Pages
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Manufacturer  CYPRESS [Cypress Semiconductor]
Direct Link  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

W48S87-04 Datasheet(HTML) 11 Page - Cypress Semiconductor

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W48S87-04
PRELIMINARY
11
How To Use the Serial Data Interface
Electrical Requirements
Figure 5 illustrates electrical characteristics for the serial inter-
face bus used with the W48S87-04. Devices send data over
the bus with an open drain logic output that can (a) pull the bus
line LOW, or (b) let the bus default to logic 1. The pull-up resis-
tors on the bus (both clock and data lines) establish a default
logic 1. All bus devices generally have logic inputs to receive
data.
Although the W48S87-04 is a receive-only device (no data
write-back capability), it does transmit an “acknowledge” data
pulse after each byte is received. Thus, the SDATA line can
both transmit and receive data.
The pull-up resistor should be sized to meet the rise and fall
times specified in AC parameters, taking into consideration to-
tal bus line capacitance.
DATA IN
DATA OUT
N
CLOCK IN
CLOCK OUT
CHIP SET
(SERIAL BUS MASTER TRANSMITTER)
SDCLK
SDATA
SERIAL BUS CLOCK LINE
SERIAL BUS DATA LINE
N
DATA IN
DATA OUT
CLOCK IN
CLOCK DEVICE
(SERIAL BUS SLAVE RECEIVER)
SCLOCK
SDATA
N
~ 2k
~ 2k
VDD
VDD
Figure 5. Serial Interface Bus Electrical Characteristics


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