¡ Semiconductor

MSM6926/6946

1/25

¡ Semiconductor

MSM6926/6946

300 bps Single Chip FSK MODEM

GENERAL DESCRIPTION

The MSM6926 and the MSM6946 are OKI's 300 bps single chip modem series which transmit and

receive serial, binary data over a switched telephone network using frequency shift keying (FSK).

The MSM6926 is compatible with ITU-T V.21 series data sets, while the MSM6946 is compatible

with Bell 103 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.21 (MSM6926)

• Compatible with BELL 103 (MSM6946)

• CMOS silicon gate process

• Switched capacitor and advanced CMOS analog technology

• Data rate from 0 to 300 bps

• Full duplex (2-Wire)

• Originate and Answer modes

• Selectable built-in timers and external delay timers possible

• All filtering, modulation, demodulation, and DTE interface 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: MSM6926RS)

(Product name: MSM6946RS)

44-pin plastic QFP

(QFP44-P-910-0.80-K)

(Product name: MSM6926GS-K)

(Product name: MSM6946GS-K)

(QFP44-P-910-0.80-2K)

(Product name: MSM6926GS-2K)

(Product name: MSM6946GS-2K)

E2A0009-16-X1

This version: Jan. 1998

Previous version: Nov. 1996