Advanced Communications
ACS104A Data Sheet
PIN DESCRIPTION
PLCC- TQFP-
28 Pin 44 Pin
PLCC- TQFP-
Symbol IO
Name
Mode
Description
Sym
IO
Name
Description
28 Pin
44 Pin
Will reset the device when
PORB = 0. Connect to an RC
circuit as in figure 4, so a reset
performed on power-up.
1
-
6
7
8
DP1
GND
DCDB
I
-
Selects operating mode
Power Supply
Selection
Power-on-
Reset
14
27
PORB
I
Ground
Data Carrier
Detect
Modem control signal - LOW
when modems locked
15
16
28
29
DR1
DR2
Data Rate
Select
The DR(1:3) inputs select the
Data Rates, see p3
2
O
I
I
Request To
Modemcontrol signal or
-
17
18
30
31
33
DM3
DM2
DM1
DM(1:3) input select for
Diagnostic Modes such as local
loopback and remote loopback
Diagnostic
Modes
3
-
9
RTS
RIO
DSR
I
Send & Data additional low frequency data
Channel 2 i/p channel input
An alternative data channel
Internally
connected
-
32
IC
O
Should not be connected to.
Ring indicator which may be for the
output
10
11
O
O
propagation of the RS232 Ring
indicator signal.
-
-
-
34
35
-
NSB
GND
NC
I
-
-
New Slice Bar Connect to GND.
Data Set
Modemcontrol signal or
Ground
Ground Supply
Not connected
4
Ready & Data additional low frequency data
Channel 3 o/p channel output
Not connected
Integrating capacitor is placed
between CNT and GND of
value 10nF-47nF with an XTAL
of 27-5Mhz
Internally
2
-
5
-
12
13
14
IC
O
O
I
Should not be connected to.
connected
Capacitor
Integration
19
36
CNT
IO
RxD
DR3
Received Data Received data
Data Rate
Select
The DR(1:3) inputs select the
Data Rates, see p2.
20
37
GND
-
Ground
Ground Supply
21
22
38
39
PINN
PINP
I
I
PIN Cathode
PIN Anode
Connections to a PIN diode
Connect fundamental parallel
resonance crystal with padding
capacitors to GND
6
7
15
16
XLI
XLO
I
O
Oscillator
Crystal
23
24
40
41
LAN
LAP
IO LED Cathode
IO LED Anode
Connections to LED or LASER
Power supply, 3.3-5.25 Volts
Should not be connected to.
8
-
17
18
GND
IC
-
Ground
Power Supply ground.
25
-
42
43
VA+
IC
-
+ve Supply
Internally
connected
O
Should not be connected to.
Internally
connected
O
+ve power
supply
9
19
20
VD+
TxD
-
I
Power Supply, 3.3-5.25 Volts
Defines transmit current to the
LED. Minimum and maximum
values are set by connecting
TRC to GND via a resistor,
value R defined by equation on
page 2.
10
Transmit Data Transmitted data
Transmit
Current
26
44
1
TRC
RII
I
I
Indicates quality of line. If a
coding infringement is detected,
ERD goes High. Reset by
PORB to Low
-
21
22
ERL
DTR
O
I
Error Detector
An alternative data channel
Data Terminal Modemcontrrol signal or
Ready/Data / additional low frequency data
Channel 3 i/p channel input
Ring indicator which may be for the
input
-
11
propagation of the RS232 Ring
indicator signal.
'Heart beat'
Lock & power lock, pulses slowly when
up indicator
Indicates power up and modem
Mode
Selection
-
27
-
2
3
4
DP4
DP3
VD+
I
I
-
Selects operating mode
12
-
23
24
25
26
HBT
HD1
CTS
HD2
O
I
locked, fast unlocked.
Mode
Selection
Selects operating mode
Handshake
Delay
Sets the Handshake bandwidth,
see p4
Clear To Send Modemcontrol signal or
& Data additional low frequency data
Channel 2 o/p channel output
+ve Supply
Power Supply, 3.3-5.5 Volts
13
-
O
I
Mode
Selection
28
5
DP2
I
Selects operating mode
Handshake
Delay
Sets the Handshake bandwidth,
see p4
7