ACS101A Semtech Corporation, ACS101A Datasheet - Page 6

• Manufacturer Part Number: ACS101A
• Description: Acapella Optical Modem ic
• Manufacturer: Semtech Corporation

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