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參數(shù)資料
| 型號(hào)： | MAS7838S-T |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | SYNCHRONOUS TO ASYNCHRONOUS CONVERTER SAC CMOS |
| 中文描述： | 轉(zhuǎn)爐同步的異步國(guó)資委的CMOS |
| 文件頁數(shù)： | 2/9頁 |
| 文件大小： | 110K |
| 代理商： | MAS7838S-T |
DA7838.002
20 September, 2000
2 (9)
126
Top marking: YYWW = Year Week, XXXXX.X = Lot Number, =ESD Indicator
101
1/#
1/"(
7
2/"
TSL
1
I
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 (TSL=0) or 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 to be 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.
TMG
2
I
OSC
TXC
3
4
O
I
CL1
CL2
XESR
5
6
7
I
I
I
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 4). 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
VSS
TDI
TDO
8
9
10
G
I
O
XASY
11
I
XHST
12
I
RDO
13
O
RDI
14
I
RXC
15
I
VDD
16
P
PDIP 16
TSL
TMG
OSC
TXC
CL1
CL2
XESR
VSS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16 VDD
RXC
RDI
RDO
XHST
XASY
TDO
TDI
TSL
TMG
OSC
TXC
CL1
CL2
XESR
VSS
1
2
3
4
5
6
7
8
SO16
9
10
11
12
13
14
15
16 VDD
RXC
RDI
RDO
XHST
XASY
TDO
TDI
MAS7838N
MAS7838S
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