ACS101A View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'ACS101A' PDF : 12 Pages View PDF
Pin Descriptions
Pin Sym IO
Name
Description
1
DR1
I Data Rate Select
The DR1-DR4 inputs select the
Data Rates.
2 DP1 - Digital Preset
Leave unconnected, for normal
fibre applications.
Set high to select special digital
interface mode (see p5).
DM1-DM3 inpust select the
3 DM1 I Diagnostic Modes Diagnostic Modes such as local
loopback and remote loopback.
4 RxD O Received Data
Received data.
5
6
DP2
DP3
- Digital Preset
Leave unconnected, for normal
fibre applications.
Set low to select special digital
interface mode (see p5).
Request To Send / Modem control signal or
7 RTS I Data Channel 2 additional low frequency data
input
channel input
2
8
TxD I Transmit Data
Transmitted data
9
10
XLI
XLO
I
O
Oscillator Crystal
Connection to fundamental
parallel resonance crystal with
padding capacitors to GND
11 CKC I Clock Control
Configures the TxCL pin for
either internally or externally
generated clocks
12
TxCL
IO
Transmit Data
Clock
Transmit Data Clock, frequency
set by DR1-DR4, input or
output depending on CKC.
13
RxCL
Receive Data
O Clock
Receive Data Clock, turned off
in asynchronous mode
14
15
DM2
DM3
I
Diagnostic Modes
Diagnostic modes select see
DM1 pin and main text
Data Terminal
Modem contrrol signal or
16 DTR I Ready /
additional low frequency data
Data channel 3 i/p channel input
In normal fibre applications
17
ERD /
DO
Error Detector /
O Digital mode data
output
indicates quality of link. If a
coding infringement is detected,
ERD goes High. Data output in
special digital interface mode.
18
DI
I
Digital mode
data input
Data input in special digittal
interface mode. Not used in
normal fibre applications, can be
left disconnected.
19 PORB I Power-on-Reset
Will initiate the device when
PORB=0. PORB is normally
connected to a capacitor to gnd
so that a POR is automatically
invoked on power-up.
Clear To Send / Modem control signal or
20 CTS O Data Channel 2 additional low frequency data
output
channel output
Data Set Ready / Modem control signal or
21 DSR O Data Channel 3 additional low frequency data
output
channel output
22
DCDB
O
Data Carrier
Detect
Goes low when modems locked
and ready for data transmission
Pin Sym IO
Name
23 GND - Ground
Description
Ground Supply
24 VD+ - +ve power supply Power Supply, 4.75-5.25 Volts
RS232 handshake Modem control signal,
25 RSS I or data channels Low = data transmission mode,
select
High = modem handshake mode
26
LIN /
RW
O
Lock Indicator /
Receive Window
In normal fibre mode indicates
modem lock, high when both
modems locked together. In
digital interface mode indicates
the receiving window, high when
the data burst being received.
27 TxD I Transmit Data
Normally unconnected as main
data is input on Pin8, but is used
to maintain compatibilty with
ACS100
28 IC
-
Internally
connected
Should not be connected to,
only used for test access.
29 NC - Not connected
Can be connected to or not.
30 GND - Ground
31
CNT
IO
Capacitor
Integration
32 GND - Ground
Ground Supply
Integrating capacitor is placed
between CNT and GND of
value 10nF-33nF with an XTAL
of 19MHz to 5MHz
Ground Supply
33 LDN IO LED Cathode
34 NC - Not connected
35 LDP IO LED Anode
36 GND - Ground
Connection to LED used for
transmission and receiption
Can be connected to or not.
Connection to LED used for
transmission and receiption
Ground Supply
37 VA+
38 VG
39 NC
- +ve power supply Power supply, 4.75-5.25 Volts
-
Guard ring &
mode select
Can be left unconnected or
connected to VA+. Pulled high
internally.
- Not connected
Can be connected to or not.
40 DR4 I Data Rate Select Data rate select, see DR1
Defines transmit current to the
41 TRC
I Transmit Current
LED. Set by connecting TRC
to GND via a resistor, value R
defined by equation on page 2
42 DR2 I Data Rate Select Data rate select, see DR1
43 GND - Ground
Ground Supply
44 DR3 I Data Rate Select Data rate select, see DR1
ACS101A Issue 1.2 October 1999.
6
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