MM5457 NSC | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 4
Technical content
Ree, CE SS SS oT Ea a AT mews ES - aS a ew B Fy National Digital Clocks & y J ne ~ | MM5456, MM5457 Digital Alarm Clocks E General Description ‘The MM5456, 57 digital alarm clock radio chips The MM5456, MM5457 are bonded in a 22-pin package. = | are monolithi€ MOS integrated circuits utilizing N-chan- The MMS457 has a 24-hour/50 Hz option and the SS | rel, tow threshold, enhancement mode and ion-im- _ MMS456 has the 12hour/50 Hz or 12hour/60 Hz planted depletion mode devices. options. Each circuit contains all the logic necessary for a digital Features clock with sleep and alarm control and is intended for . clock-radio applications. © Duplex LED display drive © Fast/slow set capability Real time and alarm time are displayed in hours-minutes © 24-hour alarm and sleep time is displayed in minutes, when setting = “Snooze” function (9 minutes) the sleep counter. ® On-chip alarm oscillator ™ Alarm tone output gated at a 2 Hz rate An alarm output is provided that “beeps” a 50% duty = Power fail indication—entire display flashes at a cycle, 700 Hz signal gated at 2 Hz rate when the alarm 1 Hz rate set time and the real time matches. A sleep output that provides a DC level is used to control the radio. Automatic power-on reset It is activated with the alarm output or programmed ™ PM display indicator via the sleep counter to turn OFF from 0 to 59 minutes © Presettable 9 minute sleep timer after the sleep counter is set. A snooze feature is provided for a 9-minute recurrence Applications of the alarm after it has sounded. = Alarm clocks © Desk clocks Setting is done via the standard fast and slow set buttons. aw Clock radio when in the time set, alarm set or sleep set modes. mA bile clock: These control inputs are TRI-STATE® inputs to reduce ‘utomobile clocks pin count. = Stopwatches ™ Industrial clocks The 50/60 Hz clock selects what segment data is on ™ Portable clocks the outputs, i.e., a duplex LED display interface. = Timers Block Diagram sono : Seowent Gurruts . isrtay mux © tansase: 2 OUTPUTS snooze .o0ie TIME SET/RUN/ ¢, 000 ALARM SET roe ka stowset 0s Re ALARROsE/ LEER ALARM AuaMoN “OUT TONE OUT SLEEP StF 5-70
7 ae em Tl i et eae i a ee i i ni ieee aes | Absolute Maximum Ratings (Exceeding the following ratings may result in permanent damage to the device) Voltage at Any Pin Vgg to Vsg +12V Operating Temperature =25°C to +70°C Storage Temperature ~88°C to +150°C Lead Temperature (Soldering, 10 seconds) 300°C z Electrical Characteristics Power supply voltage should not exceed a maximum of 12V under any circumstances. Ta within operating range, Vpp = 7V to 11V PARAMETER CONDITIONS [ min | Typ | MAX | UNITS N Power Supply Voltage Output Driving Display 9 TW Vv Functional — Count Operating 7 " v Power Supply Current No Output Loads Vop = 7V 4 mA Vop = 11V 5 mA 50/60 Hz Input Frequency oc 50/60 10k Hz Logical “0”, Low Level Vss Vss_ | Vsst0.5 v Logical ‘"1"’, High Level 0.7Vpp | Yoo Vop Vv Input Leakage VIN = VoD oF Vss 10 HA All Other Input Voltages Logical "0", Low Level Vss Vss_| Vggt0.5 v Logical ‘“1"", High Level Vop-1 Vop Vop v Power Failure Detect Voltage (Vpp Voltage) 1 5 v Alarm Output, Sleep Output Vop = 11V Sourcing, Logical ’1’" High VoH= Vop - 1V 1 uA Sinking, Logical “0 Low VoL= Vss+ 6V 5 mA Alarm Output Frequency R= 68k, C= 0.10F 700 Hz Segment Outputs (Except Vop = 10V HTADEG) Output Sink, Logical “0” Low | VoL = Vss+2V 20 mA Leakage, Logical “1’’ High VOH * VoD 10 uA Segment Output (HTADEG) Vpp = 10V Output Sink, Logical “0” Low | VoL = Vss+2V 40 mA Leakage, Logical ‘*1"" High Vou = Yop. 10 HA Functional Description 50 or 60 Hz Input:A shaping circuit is provided inter- time other than 59 minutes. When the alarm sounds, nally to: square the 50 or 60 Hz input. This circuit the snooze can be activated by momentarily con- allows use of a half sinewave input. A resistor in series necting fast set pin to Vpp. This will turn off the must be used to limit current into the MOS device. alarm for 9-10 minutes, after which the alarm will again be sounded. The snooze alarm feature may be 24-Hour/50 Hz, 12-Hour/60 Hz, 12-Hour/60 Hz repeatedly used for up to 69 minutes or until alarm (MM5456): When this input is connected to Vpp, the OFF is activated by momentarily connecting this pin display will be 12 hours with 50 Hz input. If left floating, to Vpp. When alarm OFF is activated, the alarm latch the display will be 12 hours with 60 Hz input. (The will reset and silence the alarm. The alarm will auto- MM5457 is internally bonded to select the 24-hour/50 matically sound again in 24 hours (or at a new alarm Hz mode, The MM5456 selects the 12-hour/50 Hz or the setting). If it is desired to silence the alarm for a day 12-hour/60 Hz modes.) . ‘or more, the alarm OFF input should remain at VoD- The alarm can be enabled again by allowing the input Sloop Set/Alarm Enable/Alarm OFF: Whenever this to float. input is connected to Vgg, the sleep counters will display and be set to 59 minutes, if previously at 00 External RC: The resistor and capacitor on this pin minutes. Fast set or slow set may be used to preset set the frequency of the alarm tone. The frequency is 571
B Functional Description (continued) = nominally set to 1400 Hz in order to produce a700H2z 700 Hz tone will be gated by a 20% duty cycle 2 Hz Ss (50% duty cycle) tone at the alarm output. signal (i.e., the alarm tone will be ON for 100 ms and -” OFF for 400 ms). This output contains an internal Time Set/Run/Alarm Set: This input must be activated Pull-up to Vpp in order to turn OFF the external in order to set the time counter and alarm counter. When PNP transistor driver when the alarm is inactive. connected to Vpp, the time counter will be displayed . and may be set with the fast-slow input. Upon release - of fast and slow set, the time counter will be in a hold Sleep Output: This output. remains at Vpp when Ss mode. If time set/alarm set is left floating, the time inactive. When the alarm latch becomes set or the sleep counter will be displayed, and the fast-slow input will counter is at other than 00 minutes, the sleep output be disabled (normal run mode). When this input is con- will be ON. Snooze or alarm OFF function will dis- nected to Vgg, the alarm counter will be displayed able this output simultaneously with alarm output and may be set with the fast-slow input. if activated by alarm latch. Snooze function will disable this output at any time if activated by sleep counter being set. This output contains an internal pull-up Fast Set/Run/Slow Set: Whenever this input is con- nected 0 VOD and time set or alarm set is activated, © VOD in order to turn OFF the external PNP trans ‘the appropriate counter will advance at a 60 Hz rate, stor switch when the output is inactive, If connected to Vgg,the minutes counter will advance at 2 Hz with carry into the hours counter. If left floating, the clock will keep normai time. When connected to ‘Segment Cuwpet: All segment outputs are open-drain Vop and sleep set is activated, the sleep counter will devices with all sources common to Vgg, count downward at a 10 Hz rate. If connected to Vss, the sleep counter will count downward at the slower Power ON and Power Failure: After power ON or rate; 2 Hz. power fail, the display will flash at 1 Hz rate and time, alarm, and seconds counters will be reset to 0:00:00 Alarm Output: This output remains at Vop when inac- (12:00:00}. The alarm output will be held OFF also. tive. When the alarm latch becomes set, the alarm The power fail can be reset by enabling time set allow. Typical Application ‘s aurtexoir.ay i u } EE EEE EEE EEE sore suc ine suctrovr 4% one * Lawl extrac vausase goon e ave, cr ia i vame] 4 ALARM steer |!7 Aan FaST |! ‘stow an Eg ae ier or se Br soaze “™ voy 1m 04-0 is " * ™ = 100 Lie 5-72
Be a a is SE ea Oe, SN Me mmr ASSLT, | RCE eke Connection Diagrams (0ua!-in-Line Packages, Top Views) ; ‘ i 12-Hourl50 or 60 Hz Clock FY ‘HUB, HUG: 1 2 ‘HTB, PM MUC, HUD: 2 2 ‘HTC, HUE ‘HUA, HUF: 3 20) ‘SLEEP OUT vss 4 9 12/60, 12/50 > MTF, MTA. 5 18} 50/60 Hz INPUT ALARM OFF/ALARM ON/ ‘MTB, MTG 6 ‘MMS456 17] SLEEP SET ‘MTD, MTC: 7 16 EXT. RC TE, MuE—8 15}— Yoo MUB, MUG is 14 TIME SET/RUM/ALARM SET muc, MUD 10 13) PAST SET (SNOGZE)/ RUN /SLOW SET MUA, MUF 911 12] ALARM TONE OUT Order Number MMS456N | ‘See Package 22 24-Hourl50 Hz Clock ‘HUB, HUG: uy 2) ‘HTB, PM ‘UC, HUD: 2 a ‘HTADEG: HUA, HUF. 3 2) ‘HTC, HUE ss. 4 19) ‘SLEEP OUT MTF, MTA. s 18) ‘SOHz INPUT ALARM OFF/ALARM ON/ wre, mTc—]6 Musas? 17} ALARM OF TO, MTC: 7 16} EXT. RE MTE, MUE— 8 18}— Yoo ~ MUB, MUG is 14) TIME SET/RUN/ALARM SET ‘MUC, MUD 10 a FAST SET (SNOOZE)/ RUN /SLOW SET MUA, MUF 11 12, — ALARM TONE OUT Order Number MM5457N ‘See Package 22 573