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PDF MXL1344A Data sheet ( Hoja de datos )
| Número de pieza | MXL1344A | |
| Descripción | Software-Selectable Cable Terminator | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-1775; Rev 0; 2/01
+5V Multiprotocol, Software-Selectable
Cable Terminator
General Description
The MXL1344A contains six software-selectable, multi-
protocol cable termination networks. Each network is
capable of terminating V.11 (RS-422, RS-530, RS-530A,
RS-449, V.36 and X.21) with a 100Ω differential load,
V.35 with a T-network load, or V.28 (RS-232) and V.10
(RS-423) with an open-circuit load for use with trans-
ceivers having on-chip termination. The termination pro-
tocol can be selected by the serial interface cable
wiring or by software control. The MXL1344A replaces
discrete resistor termination networks and expensive
relays required for multiprotocol termination, saving
space and cost.
The MXL1344A terminator is designed to form a com-
plete +5V cable- or software-selectable multiprotocol
DCE/DTE interface port when used with the MXL1543
and MXL1544/MAX3175 transceiver ICs. The MXL1344A
terminator can use the VEE power generated by the
MXL1543 charge pump, simplifying system design. The
MXL1344A, MXL1543, and MXL1544/MAX3175 are pin-
for-pin compatible with the LTC1344A, LTC1543, and
LTC1544, but for proper operation the entire Maxim
chipset must be used without substituting other manu-
facturer's parts on a chip-by-chip basis.
The MXL1344A is available in a 24-pin SSOP package
and is specified for the 0°C to +70°C commercial tem-
perature range.
Features
o Certified TBR-1 and TBR-2-Compliant Chipset
(NET1 and NET2)—Pending Completion of
Testing
o Supports V.10 (RS-423), V.11 (RS-422, RS-530,
RS-530A, RS-449, V.36, and X.21), V.28 (RS-232)
and V.35 Termination
o Cable- or Software-Selectable Termination
o Cable- or Software-Selectable DTE/DCE
o Replaces Discrete Resistor Termination Networks
and Expensive Relays
o Available in Small 24-Pin SSOP Package
Data Networking
CSU and DSU
Data Routers
Applications
PCI Cards
Telecommunication Equipment
Data Switches
Ordering Information
PART
MXL1344ACAG
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
24 SSOP
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
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LL CTS DSR
DCD DTR RTS
RXD RXC
TXC SCTE TXD
D4
R4
R3
R2
MXL1544/ D3
R1 MAX3175
D2
D1
R3
R2
MXL1543 D3
R1
D2
D1
MXL1344A
18 13 5 10 8
22 6 23 20 19 4
1 7 16 3 9 17
12 15 11 24 14 2
DB-25 CONNECTOR
________________________________________________________________ Maxim Integrated Products 1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
+5V Multiprotocol, Software-Selectable
Cable Terminator
A
A
I
AMMETER
VDM = ±2V
R1 = 52Ω
S1 ON
R3 = 127Ω
S2 OFF
R2 = 52Ω
B
VCM = ±7V OR ±2V
RDM
=
VDM
I
Figure 1. V.11 or V.35 Differential Impedance Measurement
R1 = 52Ω
AMMETER
I
VCM = ±2V
RCM
=
VCM
I
S1 ON
R3 = 127Ω
S2 ON
R2 = 52Ω
B
Figure 2. V.35 Common-Mode Impedance Measurement
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1 M0
24 M1
MXL1344A
23 M2
22 DCE/DTE
21 LATCH
VCC VEE
14 2
3 8 11 12 13
12 34 5 6
5 4 6 7 9 10 16 15 18 17 19 20
Figure 3. Block Diagram
chipset must be used without substituting other manu-
facturer's parts on a chip-by-chip basis.
Termination Modes
The termination networks in the MXL1344A can be set
to one of three modes, V.11, V.35, or high impedance
(high-Z). As shown in Figure 4, in V.11 mode, switch S1
is closed and switch S2 is open, presenting 104Ω
across terminals A and B. In V.35 mode, switches S1
and S2 are both closed, presenting a T-network with
104Ω differential impedance and 153Ω common-mode
impedance. In high-Z mode, switches S1 and S2 are
both open, presenting a high impedance across termi-
nals A and B suitable for V.28 and V.10 modes.
_______________________________________________________________________________________ 5
5 Page 
+5V Multiprotocol, Software-Selectable
Cable Terminator
A′
R1 MXL1344A
52Ω
S1
S2
R3
127Ω
A
R5
30kΩ
R8
5kΩ R6
10kΩ
S3
MXL1543
RECEIVER
R2
52Ω
B′
R7
10kΩ
R4
B 30kΩ
C′
GND
Figure 10. V.28 Termination and Internal Resistance Networks
SERIAL
CONTROLLER
TXD
SCTE
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TXC
RXC
RXD
DTE
MXL1543
D1
D2
D3
R1
R2
R3
MXL1344A
TXD
SCTE
MXL1344A
104Ω
104Ω
104Ω
104Ω
104Ω
TXC
RXC
RXD
DCE
MXL1543
R3
R2
R1
D3
D2
D1
SERIAL
CONTROLLER
TXD
SCTE
TXC
RXC
RXD
MXL1544/MAX3175
MXL1544/MAX3175
RTS D1 RTS R3 RTS
DTR D2 DTR R2 DTR
D3
DCD R1
DSR R2
DCD
DSR
R1
D3 DCD
D2 DSR
CTS R3
LL D4
R4
CTS
LL
D1 CTS
R4 LL
D4
Figure 11. DTE-to-DCE X.21 Interface
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MXL1344A.PDF ] | |
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