73K324L 查看數據表（PDF） - Unspecified

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73K324L

CCITT V.22bis, V.22, V.21, V.23, Bell 212A Single-Chip Modem

Unspecified 

73K324L

CCITT V.22bis, V.22, V.21, V.23, Bell 212A

Single-Chip Modem

PIN DESCRIPTION

POWER

NAME

GND

VDD

TYPE

I

I

VREF

O

ISET

I

DESCRIPTION

System Ground.

Power supply input, 5V -5% +10%. Bypass with 0.22 µF and 22 µF capacitors to

GND.

An internally generated reference voltage. Bypass with 0.22 µF capacitor to GND.

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 0.22 µF capacitor.

PARALLEL MICROPROCESSOR INTERFACE

ALE

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 /

Tristate

I

Address/data bus. These bidirectional tri-state multi-plexed lines carry information

to and from the internal registers.

Chip select. A low on this pin 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.

CS is latched on the falling edge of ALE.

CLK

O

Output clock. This pin is selectable under processor control to be either the crystal

frequency (for use as a processor clock) or 16 x the data rate for use as a baud

rate clock in QAM/DPSK modes only. The pin defaults to the crystal frequency on

reset.

INT

O

Interrupt. This open drain weak pullup, 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 active until

the processor reads the detect register or does a full reset.

RD

I

Read. A low requests a read of the 73K324L internal registers. Data cannot be

output unless both RD and the latched CS are active or low.

RESET

WR

I

Reset. An active high signal on this pin will put the chip into an inactive state. All

control register bits (CR0, CR1, CR2, CR3, 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.

I

Write. A low on this informs the 73K324L that data is available on AD0-AD7 for

writing into an internal register. Data is latched on the rising edge of WR. No data

is written unless both WR and the latched CS are low.

NOTE: The Serial Control mode is provided by tying ALE high and CS low. In this configuration AD7 becomes

DATA and AD0, AD1 and AD2 become the address only. See the serial time diagrams on page 23.

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