TXC-04252AIPQ Transwitch Corporation, TXC-04252AIPQ Datasheet - Page 34

• Manufacturer Part Number: TXC-04252AIPQ
• Manufacturer: Transwitch Corporation

Specifications of TXC-04252AIPQ

• Pin Count: 160
• Screening Level: Industrial
• Package Type: PQFP
• Lead Free Status / Rohs Status: Not Compliant

Ed. 3, December 2000
QE1M
TXC-04252
TXC-04252-MB
Notes:
1. All output times are measured with a maximum 75 pF load capacitance.
2. One SPcyc equals two EXTCK clock cycles.
3. Excessive external microprocessor data RAM access could interfere with the QE1M internal data processing, result-
RDY pulse width
Data valid set up time
to WR
(The EXTCK clock frequency is 58.32 MHz. One SPcyc is about 34.29 ns.)
ing in data corruption. To prevent such a situation, when excessive external microprocessor data RAM access is
detected, QE1M tries to slow down the external microprocessor access rate by lengthening the RDY pulse width to
as high as 97 * SPcyc.
Proprietary TranSwitch Corporation Information for use Solely by its Customers.
Parameter
Register write
SPOT instruction write (Note 2)
Data RAM write (Note 3)
SPOT instruction write and
data RAM write only
DATA SHEET
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Symbol
t
t
PW(3)
SU(4)
5 * SPcyc
9 * SPcyc
SPcyc
Min
-1 *
Typ
7 * SPcyc
SPcyc
Max
29 *
0.0
Unit
ns
ns
ns
ns