MAS7838S
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Manufacturer Part#:

MAS7838S

Product Category: IC Chips
Manufacturer: MAS
Description:
  datasheetMAS7838S Datasheet
Package: SOP
Quantity: 8573 PCS
Lead Free Status / RoHS Status: Lead free / RoHS Compliant
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Manufacturer: MAS
Product Category: IC Chips
Features, Applications

Features, Applications


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The is a single chip duplex synchronous to asynchronous converter. It converts asynchronous start stop characters to synchronous character format, with stop bit deletion when required as defined in the CCITT recommendation (V.22). On the receiver channel the MAS7838 converts the incoming synchronous data to asynchronous start stop character format with stop bit insertion when required as defined in the CCITT recommendation (V.22).The MAS7838 implements the data modes for the synchronous interface as specified in the V.14 (V.22). The device can be configured to operate at any frequency to maximum device speed within the above mentioned modes.


Implements CCITT recommendations V.14 and V.22 chapters 4.1, 4.2 and 4.3 Operates in modes as defined in the CCITT recommendations V.22 (i), ii), iii), iv) and v) Transmission rate to 64 kbit/s CMOS compatible interface Low power consumption (typically 25 mW) No additional circuitry required to perform the conversion CMOS device Single =5V supply


Adapts asynchronous terminals to synchronous modems Full or half card PC modems using UART as a data source Simplifying data multiplexing in a MUX/DEMUX system


Top marking: YYWW = Year Week, XXXXX.X = Lot Number,

3LQ QDPH TSL TMG OSC TXC 3LQ QR Timing select. 0 selects asynchronous sampling timing 16 x TXC from pin 2, TMG. 1 selects asynchronous sampling timing 256...8192 x TXC from pin 2, TMG. Timing. Square wave timing signal 16 x TXC 256...8192 x TXC (TSL=1). Max f=10 MHz. Oscillator. Output for crystal. If used, the crystal is connected between pins 2 and 3. Transmitter timing. Synchronous square wave timing for transmitter. The transmitted data output, TDO is synchronized to the rising edge of TXC. The duty cycle of TXC has 50% 5%. Character length. The total character length including one start bit, one stop bit and possible parity bit is selected with the CL1 and CL2 signals. Extended signalling rate. The tolerance of the synchronous bit rate can be: XESR = 1 (basic signalling rate) TXC -2.5%...+1.0% XESR = 0 (extended signalling rate) TXC -2.5%...2.3% Ground Transmitter data input. 1 = mark or stop bit, 0 = space, start or break signal Transmitter data output. The output data is synchronized to the synchronous timing signal TXC (pin 1 = mark, 0 = space Asynchronous mode. XASY=0 Asynchronous transmission. XASY=1 Synchronous transmission. In synchronous transmission the converter is totally bypassed in both directions: TDI=TDO, RDI=RDO Higher speed signalling timing. XHST = 1 normal synchronous to asynchronous conversion (Bell 212; CCITT V.22). XHST = 0 asynchronous to synchronous conversion with higher speed synchronous timing (TXC, RXC). TXC and RXC timing must be 1-2% higher than the normal bit rate in order to allow some overspeed in the asynchronous data. On the receiver side the RX buffer is deleted and the synchronous data RDI is directly connected to the asynchronous output RDO. Receiver data output. RDO is the received data converted back to asynchronous mode. 1 = mark or stop bit, 0 = space, start or break signal Receiver data input. 1 = mark, 0 = space. The received data must be synchronized to the receiver timing RXC from the synchronous channel (pin 15). Receiver timing. Receiver square wave timing from the synchronous channel. The received data RDI must be synchronized to the rising edge of RXC. Power supply


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3DUDPHWHU Input high voltage Input low voltage Input leakage current Input capacitance load Internal pull-up resistor for digital inputs


Low to high logic transition time High to low logic transition time

3DUDPHWHU TDO delay time after TXC RDI set up time before RXC RDI hold time after RXC

Search Part number : "MAS78" Included word is 3
Part Number Manufacturer Package Quantity Description
MAS7831 N/A PLCC44 830
MAS7838N MAS DIP 4088
MAS7838S-T MAS SOP-16 71
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