FX707 CMLMICRO | Alldatasheet
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= a H Consumer Microcircuits Limited fg) Code Selector & FX707 Automatic Repeat Encoder Obsolete Product Publication D/707/2 March 1984 - For Information Only - On-Chip Strobe for Noise Automatic Repeat Tone Rejection Encoder Only One External Component Multicode Selector Required 5-Tone Selective Call for Interfaces with Thumbwheel Mobile Operation Switches une ‘AGrour st_ss hte ONTROL | LK) sarour sis oureur < LoGie ourpurs REPEAT Logie = REPEAT oureur Fig. 1 FX707 Internal Block Diagram The FX707 is a PMOS monolithic 3-way 5-pole logic encoding systems. An on-chip strobe generator rejects switch intended for use with the CML FX407/507/607 noise inputs caused by wiring interaction when coding 5-tone sequential code transceivers. It allows any one switches are located at a distance from the decoder. of three programmed codes to be selected by applying Combining the FX707 with an FX407/507/607 logic levels to two control pins. The required codes are transceiver provides a complete 5-tone selective call programmed by linking each of the three sets of five system capable of vehicle to vehicle, talk through, output pins to appropriate digits at the FX407/507/607 status transponding and other advanced operating tone select inputs, using wire links, thumbwheel modes with major savings in cost, size and engineering switches or other selector means. complexity compared with alternative conventional In addition to the code select switching, the FX707 methods. contains circuits which recognize codes containing Only one external component is necessary for correct identical consecutive digits and automatically select operation of the FX707. Ca (to ground) must be the repeat tone frequency (R) at correct points in the connected to the R output. The value of Cz must code sequence. This exclusive feature permits direct exceed 250 x the maximum possible capacitive loading decimal ‘as written’ programming of code numbers that might occur on any other output pin. In most and eliminates errors and difficulties which identical systems a value of Cp = 0.47yF will be sufficient. digits cause in manually and automatically variable
Max, voltage between any pin and + VE supply pin —20V & +0.3V Max. output switch load current —10mA Max. device dissipation at 25°C ambient temperature 400mW Operating temperature range —30°C to +85°C Storage temperature range —55°C to + 125°C Characteristics Symbol Parameter Notes Min. Typ. Max. Unit Vs Supply voltage Operating range 10 12 15 Vv Is Supply current 6 mA Fig. 2 External Connections VARIABLE CODE THUMBWHEEL cope’s Cope ’c’ SWITCH i} = —— 8 Lice E / 8 Fst RR i INPUTS re a HT] ap } R ~ ce | (eee econ rE ro eee iam De [oo sae SELECTED Ss CIrr . jo | + [ceases SE a ee Le Lo | a FX707 ka s m “vee oe : NOTE: Y= —VEor O/C NOTE: All inputs have pullups approx. 300k2 to — VE supply. Fig. 3 Pin Data Fig. 4 Package Outline 24-Pin D.I.L. Ceramic Pin No. Function Pin No. Function cnn mim 1 5A 13 —VE Supply “IP fie 2 4A) yp 14 «$5 yopeeeee i Ty soe se 3 3A output: 15 S4 © . o | a 4 2A | UNPUIS 4683 4 mi ju4 fe 5 1A 17 82 eee Fou 6 1C 18 +VE Supply _—4 oe 7 2| ¢ 19 OR aie 9 ag foutus 2) fe] be 10 5C 22 «3B ‘ 4
11 Control D1 23 2B | outputs i TIMI ~,
12 Control D2 24 «1B °
\\ as een ere ae Handling Precautions 1 The FX707 is a PMOS integrated circuit which includes input View from pinside protection. However, precautions should be taken to prevent static discharges which can cause damage. CML does not assume any responsibility for the use of any circuitry described. No circuit patent licences are implied and CML reserves the right at any time without notice to change said circuitry. (aiqyy] 4CONSUMER MICROCIRCUITS LIMITED Telephone: 0376510 WHEATON ROAD - INDUSTRIAL ESTATE EAST : Ge] WITHAM - ESSEX CMB 37D - ENGLAND Tole RZ CMICHOG © 1984 Consumer Microcircuits Limited