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LTC2844
3.3V Software-Selectable
Multiprotocol Transceiver
FEATURES
s Software-Selectable Transceiver Supports:
RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21
s Operates from Single 3.3V Supply with LTC2846
s TUV Rheinland of North America Inc. Certified NET1,
NET2 and TBR2 Compliant,
Report No.: TBR2/051501/02
s Complete DTE or DCE Port with LTC2846
s 28-Lead SSOP Surface Mount Package
U
APPLICATIO S
s Data Networking
s CSU and DSU
s Data Routers
DESCRIPTIO
The LTC®2844 is a 4-driver/4-receiver multiprotocol trans-
ceiver. The LTC2844 and LTC2846 form the core of a
complete software-selectable DTE or DCE interface port that
supports the RS232, RS449, EIA530, EIA530-A, V.35, V.36
or X.21 protocols.
The LTC2844 operates from a 3.3V supply and supplies
provided by the LTC2846. The part is available in a 28-lead
SSOP surface mount package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
DTE or DCE Multiprotocol Serial Interface with DB-25 Connector
LL CTS DSR
DCD DTR RTS
RXD RXC
TXC SCTE TXD
LTC2844
D4
R4 R3 R2 R1
D3 D2 D1
LTC2846
D3 D2 D1
R3 R2 R1
TT
TTT
18 13 5 22 6
10 8 23 20 19 4 1 7 16 3 9 17
12 15 11 24 14 2
DB-25 CONNECTOR
2844 TA01
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LTC2844
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage
VCC ....................................................... –0.3V to 6.5V
VIN ..................................................................... – 0.3V to 6.5V
VEE ...................................................................... –10V to 0.3V
VDD ..................................................................... – 0.3V to 10V
Input Voltage
Transmitters ............................ – 0.3V to (VCC + 0.3V)
Receivers ................................................– 18V to 18V
Logic Pins ............................... – 0.3V to (VCC + 0.3V)
Output Voltage
Transmitters .................. (VEE – 0.3V) to (VDD + 0.3V)
Receivers ................................. – 0.3V to (VIN + 0.3V)
Short-Circuit Duration
Transmitter Output ...................................... Indefinite
Receiver Output ........................................... Indefinite
VEE................................................................... 30 sec
Operating Temperature Range
LTC2844CG ............................................. 0°C to 70°C
LTC2844IG ......................................... – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
VCC 1
VDD 2
D1 3
D2 4
D3 5
R1 6
R2 7
R3 8
D4 9
R4 10
M0 11
M1 12
M2 13
DCE/DTE 14
D1
D2
D3
R1
R2
R3
D4
R4
28 VEE
27 GND
26 D1 A
25 D1 B
24 D2 A
23 D2 B
22 D3/R1 A
21 D3/R1 B
20 R2 A
19 R2 B
18 R3 A
17 R3 B
16 D4/R4 A
15 VIN
G PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 90°C/ W, θJC = 35°C/ W
ORDER PART
NUMBER
LTC2844CG
LTC2844IG
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating tempera-
ture range, otherwise specifications are at TA = 25°C. VCC = 5V, VIN = 3.3V, VDD = 8V, VEE = – 7V for V.28, – 5.5V for V.10, V.11
(Notes 2, 3)
SYMBOL
Supplies
ICC
IEE
IDD
IVIN
PARAMETER
CONDITIONS
VCC Supply Current (DCE Mode,
All Digital Pins = GND or VIN)
RS530, RS530-A, X.21 Modes, No Load
RS530, RS530-A, X.21 Modes, Full Load
V.28 Mode, No Load
V.28 Mode, Full Load
No-Cable Mode
VEE Supply Current (DCE Mode Unless
RS530, RS530-A, X.21 Modes, No Load
Otherwise Noted, All Digital Pins = GND or VIN) RS530, X.21 Modes, Full Load (DTE Mode)
RS530-A, Full Load (DTE Mode)
V.28 Mode, No Load
V.28 Mode, Full Load
No-Cable Mode
VDD Supply Current (DCE Mode,
All Digital Pins = GND or VIN)
RS530, RS530-A, X.21 Modes, No Load
RS530, RS530-A, X.21 Modes, Full Load
V.28 Mode, No Load
V.28 Mode, Full Load
No-Cable Mode
VIN Supply Current (DCE Mode,
All Digital Pins = GND or VIN)
All Modes Except No-Cable Mode
q
q
q
q
MIN
TYP MAX UNITS
2.7
95 120
12
12
600 1200
1.6
14
25
1
7.5
10
0.2
0.2
1
8
10
490
mA
mA
mA
mA
µA
mA
mA
mA
mA
mA
µA
mA
mA
mA
mA
µA
µA
2
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LTC2844
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating tempera-
ture range, otherwise specifications are at TA = 25°C. VCC = 5V, VIN = 3.3V, VDD = 8V, VEE = – 7V for V.28, – 5.5V for V.10, V.11
(Notes 2, 3)
SYMBOL PARAMETER
PD Internal Power Dissipation (DCE Mode,
All Digital Pins = GND or VIN)
Logic Inputs and Outputs
VIH Logic Input High Voltage
VIL Logic Input Low Voltage
IIN Logic Input Current
VOH Output High Voltage
VOL Output Low Voltage
IOSR Output Short-Circuit Current
IOZR Three-State Output Current
V.11 Driver
VODO
VODL
Open Circuit Differential Output Voltage
Loaded Differential Output Voltage
VOD
VOC
VOC
ISS
IOZ
Change in Magnitude of Differential
Output Voltage
Common Mode Output Voltage
Change in Magnitude of Common Mode
Output Voltage
Short-Circuit Current
Output Leakage Current
tr, tf Rise or Fall Time
tPLH Input to Output
tPHL Input to Output
t Input to Output Difference, tPLH – tPHL
tSKEW
Output to Output Skew
V.11 Receiver
VTH
VTH
IIN
RIN
tr, tf
tPLH
Input Threshold Voltage
Input Hysteresis
Input Current (A, B)
Input Impedance
Rise or Fall Time
Input to Output
CONDITIONS
RS530, RS530-A, X.21 Modes, Full Load
V.28 Mode, Full Load
MIN TYP MAX UNITS
210 mW
54 mW
D1, D2, D3, D4
M0, M1, M2, DCE = GND
M0, M1, M2, DCE = VIN
IO = –3mA
IO = 1.6mA
0V VO VIN
M0 = M1 = M2 = VIN, VO = 0V
M0 = M1 = M2 = VIN, VO = VIN
RL = 1.95k (Figure 1)
RL = 50(Figure 1)
RL = 50(Figure 1)
RL = 50(Figure 1)
RL = 50(Figure 1)
VOUT = GND
–0.25V VO 0.25V, Power Off or
No-Cable Mode or Driver Disabled
LTC2844C (Figures 2, 5)
LTC2844I (Figures 2, 5)
LTC2844C (Figures 2, 5)
LTC28441 (Figures 2, 5)
LTC2844C (Figures 2, 5)
LTC2844I (Figures 2, 5)
LTC2844C (Figures 2, 5)
LTC2844I (Figures 2, 5)
(Figures 2, 5)
q2
q
q
q – 30
q
q 2.7
q
q
q – 30
q
0.8
±10
– 75 –120
±10
3
0.2 0.4
± 50
– 85 – 160
±10
V
V
µA
µA
µA
V
V
mA
µA
µA
q
0.5VODO
q ±2
q
q
q
q
q2
q2
q 20
q 20
q 20
q 20
q0
q0
±5
0.67VODO
0.2
3
0.2
±150
±1 ±100
15 25
15 35
40 65
40 75
40 65
40 75
3 12
3 17
3
V
V
V
V
V
V
mA
µA
ns
ns
ns
ns
ns
ns
ns
ns
ns
–7V VCM 7V
–7V VCM 7V
–10V VA,B 10V
–10V VA,B 10V
(Figures 2, 6)
LTC2844C CL = 50pF (Figures 2, 6)
LTC2844I CL = 50pF (Figures 2, 6)
q – 0.2
q
q
q 15
q
q
0.2
15 40
±0.66
30
15
50 80
50 90
V
mV
mA
k
ns
ns
ns
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LTC2844
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating tempera-
ture range, otherwise specifications are at TA = 25°C. VCC = 5V, VIN = 3.3V, VDD = 8V, VEE = – 7V for V.28, – 5.5V for V.10, V.11
(Notes 2, 3)
SYMBOL PARAMETER
tPHL Input to Output
t Input to Output Difference, tPLH – tPHL
V.10 Driver
VO Output Voltage
VT Output Voltage
ISS Short-Circuit Current
IOZ Output Leakage Current
tr, tf Rise or Fall Time
tPLH Input to Output
tPHL Input to Output
V.10 Receiver
VTH Receiver Input Threshold Voltage
VTH
Receiver Input Hysteresis
IIN Receiver Input Current
RIN Receiver Input Impedance
tr, tf Rise or Fall Time
tPLH Input to Output
tPHL Input to Output
t Input to Output Difference, tPLH – tPHL
V.28 Driver
VO Output Voltage
ISS Short-Circuit Current
IOZ Output Leakage Current
SR Slew Rate
tPLH Input to Output
tPHL Input to Output
V.28 Receiver
VTHL
VTLH
VTH
RIN
tr, tf
tPLH
tPHL
Input Low Threshold Voltage
Input High Threshold Voltage
Receiver Input Hysterisis
Receiver Input Impedance
Rise or Fall Time
Input to Output
Input to Output
CONDITIONS
LTC2844C CL = 50pF (Figures 2, 6)
LTC2844I CL = 50pF (Figures 2, 6)
LTC2844C CL = 50pF (Figures 2, 6)
LTC2844I CL = 50pF (Figures 2, 6)
Open Circuit, RL = 3.9k
RL = 450(Figure 3)
RL = 450(Figure 3)
VO = GND
–0.25V VO 0.25V, Power Off or
No-Cable Mode or Driver Disabled
RL = 450, CL = 100pF (Figures 3, 7)
RL = 450, CL = 100pF (Figures 3, 7)
RL = 450, CL = 100pF (Figures 3, 7)
–10V VA 10V
–10V VA 10V
CL = 50pF (Figures 4, 8)
CL = 50pF (Figures 4, 8)
CL = 50pF (Figures 4, 8)
CL = 50pF (Figures 4, 8)
Open Circuit
RL = 3k (Figure 3)
VO = GND
–0.25V VO 0.25V, Power Off or
No-Cable Mode or Driver Disabled
RL = 3k, CL = 2500pF (Figures 3, 7)
RL = 3k, CL = 2500pF (Figures 3, 7)
RL = 3k, CL = 2500pF (Figures 3, 7)
–15V VA 15V
CL = 50pF (Figures 4, 8)
CL = 50pF (Figures 4, 8)
CL = 50pF (Figures 4, 8)
MIN TYP MAX UNITS
q
50 80
ns
q
50 90
ns
q0
q0
4 16
4 21
ns
ns
q ±4
q ±3.6
0.9VO
q ±0.1
2
1
1
±6
±150
±100
V
V
mA
µA
µs
µs
µs
q –0.25
q
q
q 15
0.25
25 50
±0.66
30
15
55
109
60
V
mV
mA
k
ns
ns
ns
ns
q
q ±5
q
q
q4
q
q
±10
±8.5
±150
±1 ±100
30
1.3 2.5
1.3 2.5
V
V
mA
µA
V/µs
µs
µs
q
q2
q
q3
q
q
0.8
0.1 0.3
57
15
60 100
150 500
V
V
V
k
ns
ns
ns
4
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LTC2844
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: All currents into device pins are positive; all currents out of device
are negative. All voltages are referenced to device ground unless otherwise
specified.
Note 3: All typicals are given for VCC = 5V, VIN = 3.3V, VDD = 8V, VEE = – 7V
for V.28, – 5.5V for V.10, V.11 and TA = 25°C.
TYPICAL PERFOR A CE CHARACTERISTICS
RS530, X.21 in DCE Mode
(Three V.11 Drivers with Full
Load) ICC vs Data Rate
125
TA = 25°C
120
115
110
105
100
95
90
10
100 1000
DATA RATE (kBd)
10000
2844 G01
RS530, X.21 in DCE Mode
(Three V.11 Drivers with Full
Load) ICC vs Temperature
105
100
95
90
85
80
–40 –20
0 20 40 60
TEMPERATURE (°C)
80 100
2844 G04
RS530-A in DTE Mode
(Two V.10 Drivers with Full Load)
IEE vs Data Rate
26
TA = 25°C
24
22
20
18
16
14
10
20 30 40 50 60 70 80 100
DATA RATE (kBd)
2844 G02
RS530-A in DTE Mode
(Two V.10 Drivers with Full Load)
IEE vs Temperature
23.5
25.4
25.3
25.2
25.1
25.0
24.9
24.8
24.7
24.6
24.5
–40 –20
0 20 40 60
TEMPERATURE (°C)
80 100
2844 G05
V.28 in DCE Mode
(Three V.28 Drivers with Full
Load) IDD vs Data Rate
10
TA = 25°C
9
8
7
6
5
4
10 20 30 40 50 60 70 80 100
DATA RATE (kBd)
2844 G03
V.28 in DCE Mode
(Three V.28 Drivers with Full
Load) IDD vs Temperature
8.20
8.15
8.10
8.05
8.00
7.95
7.90
7.85
7.80
–40 –20
0 20 40 60
TEMPERATURE (°C)
80 100
2844 G06
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