73K224BL
V.22bis, V.22, V.21, Bell 212A, 103
Single-Chip Modem w/ Integrated Hybrid
DATA SHEET
DTE USER
NAME
PIN
TYPE
DESCRIPTION
EXCLK
22
I
EXTERNAL CLOCK: This signal is used in synchronous
transmission when the external timing option has been selected.
In the external timing mode the rising edge of EXCLK is used to
strobe synchronous DPSK transmit data applied to on the TXD
pin. Also used for serial control interface.
RXCLK
RXD
26
25
21
O
O
O
RECEIVE CLOCK: The falling edge of this clock output is
coincident with the transitions in the serial received data output.
The rising edge of RXCLK can be used to latch the valid output
data. RXCLK will be valid as long as a carrier is present.
RECEIVED DATA OUTPUT: Serial receive data is available on
this pin. The data is always valid on the rising edge of RXCLK
when in synchronous mode. RXD will output constant marks if no
carrier is detected.
TXCLK
TRANSMIT CLOCK: This signal is used in synchronous
transmission to latch serial input data on the TXD pin. Data must
be provided so that valid data is available on the rising edge of
the TXCLK. The transmit clock is derived from different sources
depending upon the synchronization mode selection. In internal
mode the clock is generated internally. In external mode TXCLK
is phase locked to the EXCLK pin. In slave mode TXCLK is
phase locked to the RXCLK pin. TXCLK is always active.
TXD
24
I
TRANSMIT DATA INPUT: Serial data for transmission is applied
on this pin. In synchronous modes, the data must be valid on the
rising edge of the TXCLK clock. In asynchronous modes
(1200/600 bit/s or 300 baud) no clocking is necessary. DPSK
data must be 1200/600 bit/s +1%, -2.5% or +2.3%, -2.5 % in
extended over speed mode.
.
Page: 7 of 33
© 2005, 2008 TERIDIAN Semiconductor Corporation
Rev 7.1
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