XRT72L54 Datasheet, PDF (40/484 Pages) Exar Corporation – FOUR CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

XRT72L54
FOUR CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.2
áç
PRELIMINARY
PIN DESCRIPTION
PIN #
L1
L2
L3
L4
L9
L10
L11
L12
L17
L18
L19
L20
M1
M2
M3
M4
M9
M10
M11
M12
M17
M18
M19
M20
PIN NAME
TxInClk[2]
TxInClk[3]
RxPOS[2]
RxLineClk[3]
GND
GND
GND
GND
VDD
D[0]
NC
D[1]
RxLineClk[2]
RxPOS[3]
TxPOS[2]
TxPOS[3]
GND
GND
GND
GND
A(7)
A(8)
A(9)
A(10)
N1
TxNEG[2]
N2
TxNEG[3]
N3
TxLineClk[2]
N4
GND
N17
GND
N18
A(4)
TYPE
I
I
I
I
****
****
****
****
****
I/O
DESCRIPTION
See Description for Pin G4
See Description for Pin G4
See Description for Pin F2
See Description for Pin F1
Ground
Ground
Ground
Ground
Power Supply +3.3v ± 5%
See Description for Pin J19
I/O
See Description for Pin J19
I
See Description for Pin F1
I
See Description for Pin F2
O
See Description for Pin C1
O
See Description for Pin C1
****
Ground
****
Ground
****
Ground
****
Ground
I
See Description for Pin M20
I
See Description for Pin M20
I
See Description for Pin M20
I
Address Bus Input (Microprocessor Interface) - MSB (Most Signifi-
cant Bit):
This input pin, along with inputs A(0) - A(9) are used to select the on-
chip Framer register and RAM space for READ/WRITE operations with
the "local" microprocessor.
O
See Description for Pin D1
O
See Description for Pin D1
O
See Description for Pin E2
****
Ground
****
Ground
I
See Description for Pin M20
21