UM9151 Pulse Dialer 5V IC DIP-18

Description

UM9151 Pulse Dialer 5V IC DIP-18 The UM9151 IC DIP-18 is an integrated circuit that provides telephone pulse dialing functionality for telecommunication equipment. It accepts keypad inputs from a standard 4×3 matrix keypad and converts them into corresponding pulse sequences to interface with legacy telephone systems that use pulse dialing. The IC is housed in a through-hole 18-pin DIP package, making it easy to prototype and integrate into PCB designs. Features: 4 x 3 matrix single contact keyboard. Supply voltage range 2.5V to 5V. Inexpensive RC oscillator. Low power standby mode for redial. 22 digit capacity far redial. 18 lead dual-in-line package. Redial with either • or # key. Dialer reset for line power break → 200 msec. Pin selectable inter-digital pause (IDP). Pin selectable make/break (M/B). High speed test capability. Direct telephone line operation. Specifications: Parameter Value / Notes Part number: UM9151 Function: Telephone pulse dialer / keypad interface Technology: CMOS Package: DIP-18 (through-hole) supply voltage (Vᴅᴅ): 5V (CMOS logic supply) Supply voltage range: 2.5V to 5V Quiescent current: Low (CMOS) Inputs: 4×3 keypad matrix compatible, CMOS logic level Outputs: Pulse dialing output / control outputs Operating temperature: -20°C to 60°C Mounting: Through-hole External components: Bypass capacitors, keypad matrix, pull-ups or drivers as required by application Pinout: Pin Configuration Description 1 TEST Dialing rate = 10pps when connected to Vᴅᴅ (normal) Dialing rate = 600pps when connected to Vꜱꜱ (high speed test) 18, 2, 3, 4 R1, R2, R3, R4 Keyboard inputs 5 Vᴅᴅ Positive power supply 6, 7, 8 CKI, CK, CR These pins are connected to an RC oscillator. (clock frequency control) 9 DP Dialing pulse output. The output stage is an N-channel open drain device 10 M/B M/B = 33/66% if connected to Vᴅᴅ M/B = 40/60% if connected to Vꜱꜱ 11 IDP Iᴅᴘ = 500ms if connected to Vᴅ Iᴅᴘ = 800ms if connected to Vꜱꜱ 12 HK On-hook/Off-hook input 13 MUTE MUTE output to mute telephone speech circuit 14 Vꜱꜱ Negative power supply 15, 16, 17 C1, C2, C3 Keyboard outputs Applications: Telephone pulse-dialer modules and keypad interfaces. PABX dialer and legacy telephone equipment. Embedded telephony controllers and access control systems. DIY telephone and retro telecom projects. Any application that requires converting keypad entries to pulse dialing sequences. Packages: 1x UM9151 Pulse Dialer 5V IC DIP-18. Documents: Datasheet

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