73K224BL 데이터 시트보기 (PDF) - Unspecified

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73K224BL

V.22bis/V.22/V.21/Bell 212A/103 Single-Chip Modem w/ Integrated Hybrid

Unspecified 

PIN DESCRIPTION

POWER

NAME

PIN

GND

1

VDD

16

VREF

31

ISET

28

73K224BL

V.22bis/V.22/V.21/Bell 212A/103

Single-Chip Modem w/ Integrated Hybrid

TYPE

I

I

O

I

DESCRIPTION

System ground

Power supply input, 5 V ±10% (73K224BL). Bypass with 0.1

and 22 µF capacitors to GND.

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 MICROPROCESSOR CONTROL INTERFACE MODE

ALE

AD0-AD7

CS

CLK

INT

RD

RESET

13

5-12

23

2

20

15

30

I

ADDRESS LATCH ENABLE: The falling edge of ALE latches

the address on AD0-AD2 and the chip select on CS.

I/O ADDRESS/DATA BUS: These bi-directional tri-state

multiplexed lines carry 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.

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.

O

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.

I

READ: A low requests a read of the 73K224BL internal

registers. Data can not be output unless both RD and the

latched CS are active or low.

I

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.

5

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