ST70235A STMicroelectronics, ST70235A Datasheet - Page 17

• Manufacturer Part Number: ST70235A
• Description: Transceiver 144-Pin TQFP
• Manufacturer: STMicroelectronics

Specifications of ST70235A

• Package: 144TQFP
• Power Supply Type: Analog
• Typical Operating Supply Voltage: 1.8|3.3 V
• Minimum Operating Supply Voltage: 1.62|3 V
• Maximum Operating Supply Voltage: 1.98|3.6 V
• Case: QFP

Pin Description
Note
The ST70235A samples TxData and TxSOC signals on the rising edge of TxClk, if TxEnb is asserted.
TxClk, RxClk, AC Electrical Characteristics
TxData, TxSOC, TxAddr, TxEnb, AC Electrical Characteristics
Note: Tx data hold time is 1.2ns. All the UTOPIA hold time are guarantee by design.
RxData, RxSOC, RxClav, TxClav, AC Electrical Characteristics
TxClav
TxEnb
TxClk
TxData
TxSOC
TxRef
F
Tc
Tj
Trf
L
T5
T6
L
T7
T8
T9
T10
T11
T12
L
Name
1. Active low signal
1
Symbol
Symbol
Symbol
1
Type
O
I
I
I
I
I
Transmit Cell
available
Transmit Enable
Transmit Byte Clock
Transmit Data (8bits)
Transmit Start of Cell
Reference Clock
Clock frequency
Clock duty cycle
Clock peak to peak jitter
Clock rise fall time
Load
Input set-up time to TxClk
Hold time to TxClk
Load
Input set-up time to TxClk
Hold time to Tx Clk
Signal going low impedance to RxClk
Signal going High impedance to RxClk
Signal going low impedance to RxClk
Signal going High impedance to RxClk
Load
Meaning
Signals to the ATM chip that the physical
layer chip is ready to accept a complete cell
Signals to the ST70235A that TxData and
TxSOC are valid
Gives the timing signal for the transfer,
generated by ATM layer chip.
ATM cell data, from ATM layer chip to
ST70235A, byte wide. TxData [7] is the MSB.
Identifies the cell boundary on TxData
8kHz clock from the ATM layer chip
Parameters
Parameters
Parameters
Usage
Minimum
Minimum
Minimum
1.5
40
10
10
10
1
1
0
1
1
Remains active for the entire
cell transfer
TxData contains the first
valid byte of the cell.
Maximum
Maximum
Maximum
100
100
100
25
60
5
4
Remark
ST70235A
MHz
Unit
Unit
Unit
pF
pF
ns
ns
ns
pF
ns
ns
ns
ns
ns
ns
%
%
17/28