73K324BL
CCITT V.22bis,V.23,V.22,V.21, Bell 212A
Single-Chip Modem w/ Integrated Hybrid
DATA SHEET
The 73K324BL can be used in either of two control
APPLICATIONS INFORMATION
interface configurations: one for
a
parallel
GENERAL CONSIDERATIONS
multiplexed address/data interface, and one for a
serial interface. The parallel method is intended for
use with 8039/48 or 8031/51 compatible
microcontrollers from Intel or many other
manufacturers. The serial interface mode can be
used with other microcontrollers or in applications
where only a limited number of port lines are
available or the application does not lend itself to a
multiplexed address/data interface.
Figure 5 shows the basic circuit diagram for a
73K324BL modem integrated circuit designed to be
used in conjunction with a control processor, a
UART or RS-232 serial data interface, and a DAA
phone line interface to function as a typical
intelligent modem. The K-Series ICs interface
directly with Intel 8048 and 80C51 microprocessors
for control and status monitoring purposes. A typical
DAA arrangement is shown in Figure 5. This
diagram is for reference only and does not represent
a production-ready modem design.
In most applications the controller will monitor the
serial data for commands from the DTE and the
received data for break signals from the far end
modem. In this way, commands to the modem are
sent over the same line as the transmitted data. In
other applications the RS-232 interface handshake
lines are used for modem control.
RING DETECT
+5
TX DATA
RX DATA
+
2 M
Ω
1 μF
1
2
3
4
5
6
7
32
31
GND
CLK
RXA
VREF
RESET
N/C
11.0592 MHz
30
29
XTL1
XTL2
AD0
AD1
RING
DETECTOR
28
27
8.2 K
0.1 μF
ISET
OH
26
25
24
0.1 μF
AD2
AD3
AD4
AD5
RXCLK
RXD
TXD
HOOK
RELAY
8
9
ADR/DATA BUS
CONTROL
INTERFACE
23
22
21
10
11
12
13
FUSE
CS
+5
AD6
AD7
ALE
EXCLK
TXCLK
INT
600
Ω
μ
C ALE
1
2
3
4
20
19
μ
C
WR
RD
14
15
WR
RD
N/C
μ
C
18
17
TXA1
+5
16
VDD
TXA2
+
600
Ω
RJ - 11
0.033
TYP.
μF
TRANSIENT
SUPPRESSOR
1:1
10 μF
TRANSFORMER
0.1 μF
RXCLK
TXCLK
EXCLK
CHIP SELECT
FIGURE 5: Typical 73K324BL DAA Circuit
Page: 29 of 34
© 2005, 2008 TERIDIAN Semiconductor Corporation
Rev 6.1
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
