2
LTC2845
sn2845 2845fs
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
(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)
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)
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Supplies
ICC
VCC Supply Current (DCE Mode,
RS530, RS530-A, X.21 Modes, No Load
2.7
mA
All Digital Pins = GND or VIN)
RS530, RS530-A, X.21 Modes, Full Load
q
110
150
mA
V.28 Mode, No Load
q
13
mA
V.28 Mode, Full Load
q
13
mA
No-Cable Mode
q
700
1400
A
Short-Circuit Duration
Transmitter Output ..................................... Indefinite
Receiver Output .......................................... Indefinite
VEE.................................................................. 30 sec
Operating Temperature Range
LTC2845C ............................................... 0
°C to 70°C
LTC2845I ........................................... – 40
°C to 85°C
Storage Temperature Range ................ – 65
°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300
°C
ORDER PART
NUMBER
LTC2845CG
LTC2845IG
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
TOP VIEW
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
VCC
VDD
D1
D2
D3
R1
R2
R3
D4
R4
M0
M1
M2
DCE/DTE
D4ENB
R4EN
R5
D5
VEE
GND
D1 A
D1 B
D2 A
D2 B
D3/R1 A
D3/R1 B
R2 A
R2 B
R3 A
R3 B
D4 A
R4 A
R5 A
D5 A
VIN
VCC
R1
D2
D1
D3
R3
G PACKAGE
36-LEAD PLASTIC SSOP
D5
R5
D4
R2
R4
TJMAX = 125°C, θJA = 90°C/ W, θJC = 35°C/ W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ORDER PART
NUMBER
LTC2845CUHF
LTC2845IUHF
13 14 15 16
TOP VIEW
UHF PACKAGE
38-LEAD (7mm
× 5mm) PLASTIC QFN
17 18 19
38 37 36 35 34 33 32
24
25
26
27
28
29
30
31
8
7
6
5
4
3
2
1
D2
D3
R1
R2
R3
D4
R4
M0
M1
M2
NC
DCE/DTE
D1 B
D2 A
D2 B
D3/R1 A
D3/R1 B
R2 A
R2 B
R3 A
R3 B
D4 A
R4 A
R5 A
D1
V
DD
V
CC
V
EE
V
EE
GND
D1
A
D4ENB
R4EN
R5
D5
V
CC
V
IN
D5
A
23
22
21
20
9
10
11
12
39
TJMAX = 125°C, θJA = 34°C/ W
EXPOSED PAD IS VEE (PIN 39)
MUST BE SOLDERED TO PCB
UHF PART
MARKING
2845
2845I