73K222BL
V.22, V.21, Bell 212A, 103 Single-Chip
Modem with Integrated Hybrid
DATA SHEET
PIN DESCRIPTION
POWER
NAME
GND
VDD
PIN
1
TYPE
DESCRIPTION
I
I
System Ground
16
Power supply input, 5 V ±10%. Bypass with 0.1 and 22 µF capacitors to
GND.
VREF
ISET
31
28
O
I
An internally generated reference voltage. Bypass with 0.1 µF capacitor
to ground.
Chip current reference. Sets bias current for op-amps. The chip current is
set by connecting this pin to VDD through a 2 MΩ resistor. ISET should
be bypassed to GND with a 0.1 µF capacitor.
PARALLEL CONTROL INTERFACE
ALE
13
5-12
23
I
Address latch enable. The falling edge of ALE latches the address on
AD0-AD2 and the chip select on CS.
AD0-AD7
CS
I/O
Address/data bus. These bi-directional tri-state multiplexed lines carry
Tristate information to and from the internal registers.
I
Chip select. A low on this pin during the falling edge of ALE allows a read
cycle or a write cycle to occur. AD0-AD7 will not be driven and no
registers will be written if CS (latched) is not active. The state of CS is
latched on the falling edge of ALE.
CLK
2
O
Output clock. This pin is selectable under processor control to be either
the crystal frequency (for use as a processor clock) or 16 times the data
rate for use as a baud rate clock in DPSK modes only. The pin defaults
to the crystal frequency on reset.
INT
20
O
I
Interrupt. This open drain output signal is used to inform the processor
that a detect flag has occurred. The processor must then read the detect
register to determine which detect triggered the interrupt. INT will stay low
until the processor reads the detect register or does a full reset.
RD
15
30
Read. A low requests a read of the 73K222BL internal registers. Data
cannot be output unless both RD and the latched CS are active or low.
I/with
Pulldown
RESET
Reset. An active high signal on this pin will put the chip into an inactive
state. All control register bits (CR0, CR1, Tone) will be reset. The output
of the CLK pin will be set to the crystal frequency. An internal pull-down
resistor permits power-on-reset using a capacitor to VDD.
Page: 5 of 26
© 2005, 2008 TERIDIAN Semiconductor Corporation
Rev 7.2
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
