¡ Semiconductor

MSM6927/6947

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¡ Semiconductor

MSM6927/6947

1200 bps Single Chip FSK MODEM

GENERAL DESCRIPTION

The MSM6927 and the MSM6947 are OKI's 1200 bps single chip modem series which transmit

and receive serial, binary data over a switched telephone network using frequency shift

keying(FSK).

The MSM6927 is compatible with ITU-T V.23 series data sets, while the MSM6947 is compatible

with Bell 202 series data sets.

These devices provide all the necessary modulation, demodulation, and filtering required to

implement a serial, asynchronous communication link.

OKI's single chip modem series is designed for users who are not telecommunication experts and

are easy to use cost effective alternative to standard discrete modem design.

CMOS LSI technology provides the advantages of small size, low power, and increased

reliability.

The design of the integrated circuit assures compatibility with a broad base of installed low speed

modems and acoustic couplers. Applications include interactive terminals, desk top computers,

point of sale equipment, and credit verification systems.

FEATURES

• Compatible with ITU-T V.23 (MSM6927)

• Compatible with BELL 202 (MSM6947)

• CMOS silicon gate process

• Switched capacitor and advanced CMOS analog technology

• Data rate from 0 to 1200 bps

• Half duplex (2-Wire)

• Receive squelch delay

• Selectable built-in timers and external delay timers possible

• All filtering, modulation, demodulation, and DTE interface on chip

• Crystal controlled oscillator on chip

• TTL compatible digital interface

• Low power dissipation: 90 mW Typ.

• Package options:

28-pin plastic DIP

(DIP28-P-600–2.54)

(Product name: MSM6927RS)

(Product name: MSM6947RS)

44-pin plastic QFP

(QFP44-P-910-0.80–K)

(Product name: MSM6927GS-K)

(Product name: MSM6947GS-K)

(QFP44-P-910-0.80–2K)

(Product name: MSM6927GS-2K)

E2A0011-16-X1

This version: Jan. 1998

Previous version: Nov. 1996