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data sheet rev. 3 1 as2578 /b march 1997 telephone controller with 13 memories and 2-wire bus key features q low operating voltage q low current consumption, standby 0.1 m a q oscillator using xtal or ceramic resonator (3.58 mhz) q serial interface to external eeprom q consistent, simple and usable procedures q the settings are programmed via the keyboard and stored in eeprom or set by pin options dialler: q data protection with 20 digit fifo q sliding cursor protocol with comparison q automatic pause generation q temporary mf select via keyboard q 30 digit lnr (last number redial) q 13 x 20 digit memory (ram) on chip tone ringer: q ring frequency discrimination q 3 tone melody with 4 different repetition rates q volume of melodies can be set in 4 steps block diagramme general description the as2578 /b are a versatile repertory ld/mf diallers with a melody generator, a ring frequency discriminator and a 2-wire interface to eeprom. together with the as2520/1, the as2578 /b form a coherent basis for a fully electronic telephone with a wide range of options. the as2578 /b are especially designed to adapt to different ptt specifications. a ram is on chip for last number redial, 3 direct dial and 10 numbers with abbreviated dialling. to allow easy use under a pabx, the device incorporates automatic pause insertion and sliding cursor procedure as selectable options (as2578) or centrex keys (AS2578B). the device can be used with or without eeprom as appropriate. when an eeprom is connected, all ram content is stored in the eeprom by power loss. the circuit provides the possibility to set different modes of operation (lm codes) via the keyboard or via pin options, e.g. default signalling mode, automatic pause insertion, flash or ground loop and settings of volume and melodies. austria mikro systeme international keyscan hook state control dial dtmf melody serial interface ring frequency detector por oscillator redial 13 x 20 1 x 30 ram fifo * 0 8 7 # 9 2 5 4 1 3 6 r mute set lnr 3.58 mhz dp gl mute scl sda fci mf mo mask hs ce mode ap (as2578 only) mv rr as2578 /b vss v dd mem m1 m2 m3 d c b a (AS2578B) package available in 28 pin dip and plcc.
data sheet rev. 3 2 as2578 /b march 1997 pin description pin # symbol function 1c4 keyboard columns 2c3 3c2 4c1 5hs hook switch input this input is active high with internal pull-down resistor. 6 mode signalling (ld/mf) default mode select input mode pin function high ld default mode, make/break pulse 33/66 ms open mf only low ld default mode, make/break pulse 40/60 ms 7ce chip enable input this input is active high with internal pull-down resistor and is used to initiate setup procedures. 8 osc2 oscillator input 9 osc1 oscillator output oscillator pins for xtal or ceramic resonator (3.58 mhz). when a ceramic resonator is used a capacitor (10 - 22 pf) must be connected from each of the oscillator pins to v ss . 10 vss negative power supply 11 tone dtmf tone output the dual tones provided at this output have a level independent of the supply voltage in the operating range from 2.5 to 5.5v. 13 sda serial data i/o sda is a bidirectional pin with an open drain with internal pull-up resistor and is used to transfer data into and out of a compatible eeprom. 14 scl serial clock line output the scl output is an open drain with internal pull-up resistor and is used to clock data into and out of a compatible eeprom. 15 fci frequency comparator input schmitt trigger input for ring frequency discrimination. 12 mo melody generator output melodies for tone ringing are generated on this output. the output signal is pdm. 16 mute mute output this push-pull output is high during dialling and when mute key has been activated, otherwise low. 17 mask mask output this push-pull output is high during pulsing (make and break periods). continues
data sheet rev. 3 3 as2578 /b march 1997 pin description contd pin # symbol function 18 dpn dial pulse output this is the push-pull output for controlling the hook-switch transistor. it is low during on- hook and break periods and high during off-hook (see timing diagrammes). 19 gl ground loop output this push-pull output is high during ground loop 20 v dd positive power supply 21 r4 keyboard rows 22 r3 23 r2 24 r1 25 c5 keyboard column (as2578) this column is for the memory keys c6 keyboard column (AS2578B) this column is for centrex keys (a - d keys). automatic pause insertion and temporary mf select 1 are fixed enabled (ap open) 26 ap access pause select input (as2578) this input is used to select the automatic access pause insertion or sliding cursor (no centrex keys): ap pin function high sliding cursor enabled temporary mf select 2 open automatic pause insertion enabled temporary mf select 1 low sliding cursor and pause disabled temporary mf select 1 c5 keyboard column (AS2578B) this column is for the memory keys 27 mv melody volume select input this input is used to select the volume of the melodies in 4 steps by connecting the mv pin to row 1, 2, or 3. leaving the pin open is the default setting (max. volume). 28 rr repetition rate select input this input is used to select the repetition rate of the melodies. 4 different rates can be selected by either leaving the pin open (default) or connecting it to column 1, 2, or 3. power on reset the on chip power on reset circuit monitors the supply voltage (v dd ). as long as v dd remains below the internal reference voltage, vref (typically 1.1v), the oscillator is inhibited. when v dd rises above vref (t rise = 1 m s/v to 50 ms/v), a reset signal is generated to assure correct start- up. initial setup a low to high transition on the ce input will initiate an automatic setup, i.e. the pin options are scanned and (when an eeprom is connected) the stored lm codes and melody settings are read from the eeprom. this is done independently of the hook state (see timing diagrammes). note: "open" means 3 100 k w .
data sheet rev. 3 4 as2578 /b march 1997 memory keys the keys m1 to m3 are direct memory access keys and the mem key is used for abbreviated dialling. 13 numbers can be stored in on chip ram. each number can contain up to 20 digits (including pauses). if an eeprom is connected to the serial bus, the content of the ram is written into the eeprom when ce is turned low indicating a power loss. during programming multible pauses can be inserted by pressing the lnr key. memory dialling is cascadable. mode selection the default mode (ld or mf) can be selected by the mode pin. furthermore, the mode can be selected by setting the lm code (see setup menu). if no lm code is set, the mode will be determined by the mode pin. when default ld mode is selected, a temporary change to mf mode can be invoked by pressing * (ap = high, as2578 only) or set, * , set. when the circuit is in temporary mf mode, each of the following procedures revert it to default ld mode: - pressing set, * , set , - pressing recall key (by further entries of the recall key the signalling mode will toggle between mf and ld, - by next on-hook. recall function a recall activation will invoke a flash (timed loop break) or a ground loop (gl) depending on the selected lm code, which is stored in the external eeprom (see setup menu). if no lm code is set, depressing the recall key will invoke both a flash and a gl, however, in ld mode a flash is never executed. if recall is the first entry in a digit string, it will be stored in lnr ram when digit(s) are entered after the recall. if the recall key is depressed after a digit string has been entered or dialled out, the recall will not be stored, and subsequently entered digits will be stored in the lnr ram as the new number. if pressing the recall key is not followed by digit entries, the lnr ram remains intact. last number redial lnr is a facility that allows resignalling of the last manually dialled number without keying in all the digits again. the lnr is repeatable. the current contents of the ram are overwritten by new entries. a manually entered number is automatically stored in the lnr ram. the capacity of the ram is 30 digits. if a number greater than 30 digits is entered, the lnr facility will be inhibited (until new entries < 31 digits) and further entries will be buffered in fifo. postdialled digits, i.e. digits manually entered after lnr has been invoked, are not stored in ram but buffered in fifo. valid keys the keyscanning is enabled when ce or hs are high. during setup the keyboard is disabled. a valid key is detected from the keyboard by connecting the appropriate row to the column. this can be done using an n x m keyboard matrix with single contacts. positive and negative edges of each contact are debounced. the debounce time is 15 ms. mute key the mute key is only enabled when off-hook. depressing the mute key activates and deactivates (toggle switch) the mute output, when internal mute is inactive, i.e. in speech mode. any key entry overwrites a mute activated by the mute key, and mute will be deactivated. centrex keys (AS2578B only) the alphameric keys accommodate easy use of centrex services. the a, b, c and d keys are only valid in mf mode and are not storable. pressing one of these keys will invoke the appropriate mf tones to be transmitted. the centrex keys are not stored in the ram, but are buffered in the fifo, and subsequently entered digits are also buffered in the fifo. pressing the recall key after a sequence including centrex keys will reset the ram counter, and subsequently entered digits will be stored in the ram. if mf select (set, * , set) has been invoked once, then all susequently digits/data will be buffered in the fifo.
data sheet rev. 3 5 as2578 /b march 1997 after a recall a pause will automatically be generated. the pause time is 3 sec. the ground loop (gl) has two pulse lengths, namely a short of 500 ms and a long of 1250 ms. short gl: if the recall key is depressed for 540 ms, the gl pulse is 500 ms. long gl: if the recall key is depressed for > 540 ms, the gl pulse is 1250 ms. during redial a ground loop is only executed as a long gl (1250 ms). pause generation pause introduces a delay in signalling digit strings to accommodate second and subsequent dial tones. automatic pauses are generated in the following manner: - always after a recall independent of the ap pin - with automatic pause insertion enabled by pin option or lm code, up to two pauses can be automatically inserted at any location of the original entry in the ram (except location 1 of the digit string), when the mute output goes inactive (in mf mode for more than 1 sec.) before next entry. a pause read from the ram can be terminated (shortened) prior to time out by a low level on ap pin (as2578 only) during the pause execution. the pause time is 3 sec. during execution of a pause, mute is inactive, i.e. the circuit is in speech mode. sliding cursor procedure (as2578 only) to accommodate redialling (lnr) behind a pabx without using automatic pause generation, a sliding cursor protocol is implemented. the sliding cursor is enabled when ap = high. if new entries match the previous ram contents, pressing the lnr key will dial out the remaining digits. if there is an error in matching, the lnr will be inhibited until next on-hook, and the ram will contain the new number. serial interface the as2578 /b support a bidirectional bus oriented protocol. the protocol defines any device that sends data onto the bus as a transmitter, and the receiving device as the receiver. the as2578 /b are controlling the transfer and hence the master. the eeprom being controlled is the slave. the as2578 /b will always initiate data transfer, and provide the clock for both transmit and receive operations. therefore, the protocol is for single master applications only. however, a temporary second master can be used to write into the eeprom when the as2578 /b are supplied and in idle state. clock and data conventions data states on the sda line can change only during scl low. sda state changes during scl high are reserved for indicating start and stop conditions (see figure 1 and 2). start condition all commands are preceded by the start condition, which is a high to low transition of sda when scl is high. the slave should continuously monitor the sda and scl lines for the start condition and must not respond to any command until this condition has been met. stop condition all communications are terminated by a stop condition, which is low to high transition of sda when scl is high. the stop condition is also used to place the slave in the standby power mode. acknowledge acknowledge is a software convention used to indicate successful data transfers. the transmitting device, either master or slave, will release the bus after transmitting eight bits. during the ninth clock cycle the receiver will pull the sda line low to acknowledge that it received the eight bits of data (see figure 3). the slave should always respond with an acknowledge after recognition of a start condition and its slave address. if both the device and a write operation have been selected, the slave should respond with an acknowledge after receipt of each subsequent eight bit word. in the read mode, when the eeprom has transmitted eight bits of data, it should release the sda line and monitor the line for an acknowledge. if the as2578 /b respond with an acknowledge and does not generate a stop condition, the eeprom should continue to transmit data. if the as2578 /b do not respond with an acknowledge, the eeprom should terminate further
data sheet rev. 3 6 as2578 /b march 1997 data transmission and await the stop condition to return to the standby power mode. data change data stable sda scl figure 1 data validity start bit stop bit sda scl figure 2 definition of start and stop scl from master data out from tx data out from rx 1 8 9 start acknowledge figure 3 acknowledge response from receiver frequency comparator the frequency comparator monitors that the ring signal is in the limits as shown in figure 4. tone generator the tone generator incorporates the dtmf tones and 3 basic frequencies for the tone ringer. dtmf the dtmf generator provides 8 frequencies, namely: low group row 1 697 hz row 2 770 hz row 3 852 hz row 4 941 hz high group col. 1 1209 hz col. 2 1336 hz col. 3 1477 hz col. 6 1633 hz (AS2578B only) the mf tones are in accordance with cept recommendations. tone ringer (melody) the three basic frequencies of the melodies are: f1 = 800 hz, f2 = 1067 hz, and f3 = 1333 hz ( 5%). the repetition rate can be set via key procedures or by pin options as follows: lm code repetition rate 1 1 time (50 ms pause) 2 (default) 4 times 3 7 times 4 10 times repetition rate means that a sequence of 6 frequencies is repeated 1 to 10 times within 1 sec. for lm code 1 a pause of 50 ms is inserted between the frequencies to allow a better recognition of the melodies. the sequence of the frequencies is controlled by the sequence register as follows: sequence f1 f2 f3 f1 f2 f3 the volume of the melodies (mo output) can be set as follows: lm code volume steps 1 - 17.5 db 2 - 11.5 db 6 db 3 - 5.5 db 6 db 4 (default) 0 db 5.5 db when a continious valid ring signal is present for 80 ms, the melody generator is activated and remains active until two or more periods of the ring signal are missing. ring frequency 20 30 40 50 60 (hz) must detect tol. 70 figure 4 detection window of ringing signal
data sheet rev. 3 7 as2578 /b march 1997 lm codes and pin options lm code pin option function 02-2* ap = l automatic pause insertion: off sliding cursor: off mf select 1 02-3 ap = hi-z automatic pause insertion: on sliding cursor: off mf select 1 - ap = h automatic pause insertion: off sliding cursor: on mf select 2 033* mode = l ld mode 40/60 gl 033* mode = h ld mode 33/66 gl 036 - mf mode gl 037 - mf mode flash - mode = hi-z mf mode gl + flash 250 - resets all user settings to default and clears all ram contents 258 - clears all ram contents 5 - 4* mv = hi-z melody volume: 0 db 5 - 3 mv = r3 melody volume: - 5.5 db 5 - 2 mv = r2 melody volume: - 11.5 db 5 -1 mv = r1 melody volume: - 17.5 db 6 - 1 rr = hi-z repetition rate: 1 time (50 ms pause) 6 - 2* rr = c1 repetition rate: 4 times 6 - 3 rr = c2 repetition rate: 7 times 6 - 4 rr = c3 repetition rate: 10 times note 1: programming an lm code overwrites pin options, however, lm code 033 can only be selected when the mode pin is connected to either high or low for selecting the make/break ratio. not valid lm codes are ignored. lm codes with a '*' are default settings. note 2: when the ap pin is pulled low during execution of a pause, the pause will be terminated. note 3: ap pin option not available on AS2578B.
data sheet rev. 3 8 as2578 /b march 1997 operating procedures procedure principles the procedures for utilizing the features of the as2578 /b are optimized out of consideration for the human factor in order to: - meet the users expectations - be easy to learn and relearn - not invoke any automatic functions which the user doesnt expect - protect the user from committing critical errors, e.g. dialling wrong numbers, etc. - be consistent, simple and usable - meet the german 1 tr 2 and etr 2 specifications. idle (on-hook, no ringing) speech mode programming false programme entry invalid entry text state according to text privacy mute ringing key going off-hook going on-hook pressing a key entering a number entry according to text text 1590 enter password x sec or time out (x sec.) dialling (ld or mf) storing (writing into ram or eeprom) processing according to text text melodies activated (ringing) = reading from memory states: entries: processing: symbols
data sheet rev. 3 9 as2578 /b march 1997 setup procedures aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 1 s e t 5 o r 6 * temporary mf select programming melody any other entry aa aa a a a 40 sec s e t exit programme state 1590 l n r clear procedures false l n r any other entry lm codes 022 or 023 or 033 or 036 or 037 lm code 250 l n r s e t 022, 023 executed. 033, 036, 037 buffered l n r s e t lm code 258 l n r s e t any other sequence l n r a a a a a a a a a a a a lm codes: 022 = no ap, no sc 023 = ap, no sc 033 = ld (mode pin = v dd or vss), gl 036 = mf, gl 037 = mf, fl 250 = resets all settings to default, inhibits lnr and memories 258 = inhibits lnr and memories resets all settings to default 022, 023 executed. 033, 036, 037 buffered m 1 - 3 aaa aaa m e m storing direct numbers storing indirect numbers
data sheet rev. 3 10 as2578 /b march 1997 clear procedures 1 set 5 or 6 * temporary mf select programming melody any other entry 40 sec set exit programme state lnr any other entry lm code 258 lnr set any other sequence lnr lm codes: 258 = inhibits lnr and memories 1590 setup procedures m1-3 mem storing direct numbers storing indirect numbers
data sheet rev. 3 11 as2578 /b march 1997 programming melody 1 set 5 or 6 * temporary mf select setup procedures & clear procedure any other entry 40 sec set exit programme state any other entry key 1 , 2 , 3 , or 4 set lm codes: (5) 1 = melody volume - 17.5 db (5) 2 = melody volume - 11.1 db (5) 3 = melody volume - 5.5 db (5) 4 = melody volume 0 db (default) (6) 1 = repetition rate 1 (6) 2 = repetition rate 4 (default) (6) 3 = repetition rate 7 (6) 4 = repetition rate 10 ignored executing lm code m1-3 mem storing direct numbers storing indirect numbers
data sheet rev. 3 12 as2578 /b march 1997 programming volume of melody during ringing end of ringing any other entry key 1 , 2 , 3 , or 4 lm codes: 1 = volume - 17.5 db 2 = volume - 11.5 db 3 = volume - 5.5 db 4 = volume 0 db (default) ignored executing lm code ringing only one change during a ringing phase!
data sheet rev. 3 13 as2578 /b march 1997 temporary mf select 1 (ap pin = open or low) set, * , set ram fifo set, * , set fifo r fifo 2 1 r d set, * , set fifo exit fifo pressing any other key does not change the state.
data sheet rev. 3 14 as2578 /b march 1997 temporary mf select 2 (as2578 only) (ap pin = high) ram fifo fifo r fifo 2 1 r d set, * , set fifo exit fifo pressing any other key does not change the state. * * set, * , set set, * , set
data sheet rev. 3 15 as2578 /b march 1997 automatic dialling or m1-3 0 - 9 postdialled digits are not stored but buffered in fifo lnr mem
data sheet rev. 3 16 as2578 /b march 1997 storing numbers set 5 or 6 * temporary mf select programming melody any other entry 40 sec set exit programme state set m1-3 1 set procedures mem 0 - 9 m1-3 m1-3 mem mem m1-3 clears said ram memory location clears said ram memory location
data sheet rev. 3 17 as2578 /b march 1997 mute privacy mute

data sheet rev. 3 19 as2578 /b march 1997 electrical characteristics absolute maximum ratings positive supply voltage ........................................................................................................ ...........-0.3v v dd 7v input current .................................................................................................................. .............................. 25 ma digital input voltage ......................................................................................................v ss - 0.3v v in v dd + 0.3v electrostatic discharge (hbm) .................................................................................................. ...................... 800v storage temperature ............................................................................................................ ..........-65 c to +125 c recommended operating conditions supply voltage (except dtmf) ................................................................................................... ..2.2v v dd 5.5v supply voltage (dtmf) .......................................................................................................... .......2.5v v dd 5.5v oscillator frequency ........................................................................................................... .......................3.58 mhz operating temperature .......................................................................................................... ..........- 25 c to +70 c dc characteristics (default conditions: recommended operating conditions; outputs unloaded; v dd = 3.5v; ap and mode = vss; unless otherwise specified)) symbol parameter conditions min typ max units i dd0 standby current hs = l; ce = l 0.1 m a i dd standby current hs = h; osc. = 0 3.6 m a i dd operating current no tones 400 700 m a i dd operating current mf/melody 0.9 1.5 ma v il input voltage, low v ss 0.2 v dd v v ih line voltage, high 0.8 v dd v dd v i ol output current, sink v ol = 0.4v 1.5 ma i oh output current, source v oh = v dd - 0.4v 1 ma r hs pull-down resistor 1 m w r ce pull-down resistor 1 m w ac charateristics (default conditions: recommended operating conditions) symbol parameter conditions min typ max units t s clock startup time 5 ms t d key debounce time 14.7 ms t hs hs debounce time 14.7 ms t su setup time 100 ms continues
data sheet rev. 3 20 as2578 /b march 1997 ac characteristics contd symbol parameter conditions min typ max units dtmf v mf mf tone level high group, r l = 15 k w -12.3 -10.8 -9.3 dbm d v l-h preemphasis low to high r l = 15 k w 2.0 2.4 2.8 db thd distortion (0.3 - 4 khz) r l = 15 k w , note 3 -23 dbr t td tone duration note 1 80 82.3 85 ms t itp inter tone pause note 1 80 82.3 85 ms t tr tone rise time note 2 5 ms t tf tone fall time note 2 5 ms ld t dr dial rate 5% 10 pps t m/b make/break period 5%, mode = low 40.8/61.2 ms 5%, mode = high 33/66 ms t idp inter digit pause 800 840 880 ms t mo mute overhang t m t fd flash duration 100 102 ms t gls ground loop, short r key 540 ms 495 500 505 ms t gll ground loop, long r key > 540 ms 1200 1250 1300 ms t ap automatic pause 2.9 3.0 3.1 sec melody v mo melody output pdm t md melody delay 10 ms f1 frequency 1 770 800 830 hz f2 frequency 2 1025 1067 1110 hz f3 frequency 3 1280 1333 1385 hz t dt detection time 80 85 ms t to detection time-out note 4 ms f min min. detection frequency 19 20 21 hz f max max. detection frequency 58 59 60 hz note 1: the values are valid during automatic dialling and are minimum values during manual dialling, i.e. the tones will continue as long as the key is depressed. note 2: the rise time is the time from 10% of final value till the tone amplitude has reached 90 % of its final value. note 3: relative to high group. note 4: the fci circuit is reset by por and on-hook. after a reset the fci circuit is in a standby state. a positive edge on fci will start the 73 ms timer and the frequency discrimination is initiated. whenever a period of the ring frequency is missing, the timer is reset. when a valid ring signal is present for 3 73 ms, the melody generator is started and is directly controlled by a valid signal from the fci circuit. this condition will remain until a new reset.
data sheet rev. 3 21 as2578 /b march 1997 pin configurations 1 2 3 4 5 6 7 8 9 10 11 12 13 14 as2578 rr mv ap c5 r1 r2 r3 r4 v dd tone gl dp mask mute c4 c3 c2 c1 hs mode ce vss osc2 osc1 sda scl fci mo 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 AS2578B rr mv c5 c6 r1 r2 r3 r4 v dd tone gl dp mask mute c4 c3 c2 c1 hs mode ce vss osc2 osc1 sda scl fci mo 28 27 26 25 24 23 22 21 20 19 18 17 16 15 hs mode ce vss osc2 osc1 gl c6 r1 r2 r3 r4 v dd tone c1 c2 c3 c4 rr mv c5 scl fci mo mute mask dp sda AS2578B 1 28 pin plcc 28 pin dip hs mode ce vss osc2 osc1 gl c5 r1 r2 r3 r4 v dd tone c1 c2 c3 c4 rr mv ap scl fci mo mute mask dp sda as2578 1
data sheet rev. 3 22 as2578 /b march 1997 ordering information: part number package pin 25 pin 26 as2578 p 28 pin dip c5 ap as2578 n 28 pin plcc c5 ap AS2578B p 28 pin dip c6 c5 AS2578B n 28 pin plcc c6 c5 applications: for application support contact your local ams sales office. copyright 1995-7, austria mikro systeme international ag, schloss premst?tten, 8141 unterpremst?tten, austria. trademarks registered . all rights reserved. the material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. devices sold by austria mikro systeme are covered by the warranty and patent indemnification provisions appearing in its term o f sale. austria mikro systeme makes no warranty, express, statutory, implied, or by description regarding the information set for th herein or regarding the freedom of the described devices from patent infringement. austria mikro systeme reserves the right to change specifications and prices at any time and without notice. therefore, prior to designing this product into a system, it i s necessary to check with austria mikro systeme for current information. this product is intended for use in normal commercial applications . applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such a s military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austria mikro systeme for each application.

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