73k224bl ETC-unknow, 73k224bl Datasheet - Page 28

• Manufacturer Part Number: 73k224bl
• Description: Single-chip Modem Integrated Hybrid
• Manufacturer: ETC-unknow

73K224BL
V.22bis/V.22/V.21/Bell 212A/103
Single-Chip Modem w/ Integrated Hybrid
APPLICATIONS INFORMATION
GENERAL CONSIDERATIONS
Figure 5 shows the basic circuit diagram for a
73K224BL 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
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.
The 73K224BL is available with two control
interface versions: one for a parallel multiplexed
INTERFACE
CONTROL
with
RXCLK
TXCLK
EXCLK
CHIP SELECT
TX DATA
RING DETECT
RX DATA
C ALE
C RD
C WR
ADR/DATA BUS
10 F
Intel
+
11.0592
+5
8048
0.1 F
10
11
12
13
14
15
16
FIGURE 5: Typical 73K224BL DAA Circuit
1
2
3
4
5
6
7
8
9
GND
CLK
XTL1
XTL2
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
ALE
WR
RD
VDD
and
80C51
RESET
RXCLK
EXCLK
TXCLK
VREF
TXA1
TXA2
ISET
RXA
RXD
TXD
N/C
N/C
INT
OH
CS
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
28
+5
address/data interface, and one for a serial
interface. The parallel version is intended for use
with
microcontrollers
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. The parallel
versions may also be used in the serial mode, as
explained in the data sheet pin description.
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.
0.1 F
2 M
600
0.1 F
0.033 F
TYP.
1 F
8039/48
TRANSFORMER
600
+
1:1
8.2 K
+5
from
RELAY
HOOK
or
DETECTOR
SUPPRESSOR
TRANSIENT
Intel
RING
8031/51
FUSE
or
many
compatible
RJ - 11
1
2
3
4
other