LTC1323
Single 5V
AppleTalk
®
Transceiver
FEATURES
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
Single Chip Provides Complete
LocalTalk
®
/AppleTalk Port
Operates From a Single 5V Supply
ESD Protection to
±10kV
on Receiver Inputs
and Driver Outputs
Low Power: I
CC
= 2.4mA Typ
Shutdown Pin Reduces I
CC
to 0.5µA Typ
Receiver Keep-Alive Function: I
CC
= 65µA Typ
Differential Driver Drives Either Differential
AppleTalk or Single-Ended EIA562 Loads
Drivers Maintain High Impedance in Three-State or
with Power Off
Thermal Shutdown Protection
Drivers are Short-Circuit Protected
APPLICATI
s
s
s
S
The LTC
®
1323 is a multi-protocol line transceiver designed
to operate on AppleTalk or EIA562-compatible single-
ended networks while operating from a single 5V supply.
There are two versions of the LTC1323 available: a 16-pin
version designed to connect to an AppleTalk network,
and a 24-pin version which also includes the additional
single-ended drivers and receivers necessary to create
an Apple-compatible serial port. An on-board charge
pump generates a – 5V supply which can be used to
power external devices. Additionally, the 24-pin LTC1323
features a micropower keep-alive mode during which
one of the single-ended receivers is kept active to monitor
external wake-up signals. The LTC1323 draws only 2.4mA
quiescent current when active, 65µA in receiver keep-
alive mode, and 0.5µA in shutdown, making it ideal for
use in battery-powered systems.
The differential driver can drive either differential AppleTalk
loads or conventional single-ended loads. The driver
outputs three-state when disabled, during shutdown, in
receiver keep-alive mode, or when the power is off. The
driver outputs will maintain high impedance even with
output common-mode voltages beyond the power supply
rails. Both the driver outputs and receiver inputs are
protected against ESD damage to
±10kV.
LocalTalk Peripherals
Notebook/Palmtop Computers
Battery-Powered Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
AppleTalk and LocalTalk are registered trademarks of Apple Computer, Inc.
TYPICAL APPLICATI
1
0.33µF
2
CPEN 3
TXD 4
TXI 5
TXDEN 6
SHDN 7
RXEN 8
RXO 9
RXO 10
RXDO 11
12
LTC1323
24
CHARGE PUMP
23
22
21
DX
5V
+
0.33µF
1µF
5Ω TO 10Ω
EMI FILTER =
1µF
+
EMI FILTER
20 TXD
–
DX
19
TXD
+
EMI FILTER
EMI FILTER
EMI FILTER
EMI FILTER
8
5
2
7
4
1
6
3
18 TXO
17 RXI
RX
16 RXI
15 RXD
–
RX
EMI FILTER
EMI FILTER
14 RXD
+
RX
13
LTC1323 • TA01
U
5Ω TO 10Ω
100pF
UO
UO
1
LTC1323
ABSOLUTE
AXI U
RATI GS
Driver Short-Circuit Duration .......................... Indefinite
Operating Temperature Range .................... 0°C to 70°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
Supply Voltage (V
CC
) ................................................ 7V
Input Voltage
Logic Inputs .............................. – 0.3V to V
CC
+ 0.3V
Receiver Inputs ................................................
±15V
Driver Output Voltage (Forced) .............................
±15V
PACKAGE/ORDER I FOR ATIO
TOP VIEW
C1
+
1
C2
–
2
28 V
CC
27 C2
+
26 C2
–
25 NC
24 NC
23 V
EE
22 TXD
–
21 TXD
+
20 TXO
19 RXI
18 RXI
17 RXD
–
16 RXD
+
15 PGND
ORDER PART
NUMBER
LTC1323CG
TOP VIEW
C1
+
C1
–
1
2
16 V
CC
15 C2
+
14 C2
–
13 V
EE
12 TXD
–
11 TXD
+
10 RXD
–
9
RXD
+
CPEN 3
TXD 4
TXI 5
TXDEN 6
SHDN 7
RXEN 8
RXO 9
RXO 10
RXDO 11
NC 12
NC 13
GND 14
G PACKAGE
28-LEAD PLASTIC SSOP
T
JMAX
= 150°C,
θ
JA
= 96°C/W
TOP VIEW
C1
+
1
C1
–
2
24 V
CC
23 C2
+
22 C2
–
21 V
EE
20 TXD
–
19 TXD
+
18 TXO
17 RXI
16 RXI
15 RXD
–
14 RXD
+
13 PGND
ORDER PART
NUMBER
LTC1323CSW
CPEN 3
TXD 4
TXI 5
TXDEN 6
SHDN 7
RXEN 8
RXO 9
RXO 10
RXDO 11
GND 12
SW PACKAGE
24-LEAD PLASTIC SO WIDE
T
JMAX
= 125°C,
θ
JA
= 85°C/W
Consult factory for Industrial and Military grade parts.
2
U
U
W
W W
U
W
ORDER PART
NUMBER
LTC1323CS
TXD 3
TXDEN 4
SHDN 5
RXEN 6
RXDO 7
GND 8
S PACKAGE
16-LEAD PLASTIC SO
T
JMAX
= 125°C,
θ
JA
= 85°C/W
LTC1323
ELECTRICAL CHARACTERISTICS
SYMBOL
Supplies
I
CC
Normal Operation Supply Current
Receiver Keep-Alive Supply Current
Shutdown Supply Current
V
EE
Negative Supply Output Voltage
No Load, SHDN = 0V, CPEN = 0V, TXDEN = 0V,
RXEN = 0V
No Load, SHDN = 0V, CPEN = V
CC
, TXDEN = 0V,
RXEN = 0V
No Load, SHDN = V
CC
, CPEN = X, TXDEN = X,
RXEN = 0V
I
LOAD
≤
10mA (Note 4),
V
CC
= 5V, R
L
= 100Ω (Figure 1),
TXI = V
CC
, R
TXO
= 3k (Figure 5)
q
q
q
q
V
CC
= 5V
±10%,
T
A
= 0°C to 70°C (Notes 2, 3)
MIN
TYP
2.4
65
0.5
– 5.5
–5
MAX
4
100
10
– 4.5
UNITS
mA
µA
µA
V
PARAMETER
CONDITIONS
f
OSC
V
OD
∆V
OD
Charge Pump Oscillator Frequency
Differential Output Voltage
Change in Magnitude of Differential
Output Voltage
Differential Common-Mode
Output Voltage
Single-Ended Output Voltage
Common-Mode Range
Short-Circuit Current
Three-State Output Current
No Load
R
L
= 100Ω (Figure 1)
R
L
= 100Ω (Figure 1)
q
q
200
±8
±2
0.2
kHz
V
V
Differential Driver
Differential Driver
V
OC
V
OS
V
CMR
I
SS
I
OZ
R
L
= 100Ω
No Load
R
L
= 3k to GND
SHDN = V
CC
or CPEN = V
CC
or Power Off
– 5V
≤
V
O
≤
5V
SHDN = V
CC
or CPEN = V
CC
or Power Off,
– 10V
≤
V
O
≤
10V
No Load
R
L
= 3k to GND
SHDN = V
CC
or CPEN = V
CC
or TXDEN = V
CC
or Power Off
– 5V
≤
V
O
≤
5V
SHDN = V
CC
or CPEN = V
CC
or TXDEN = V
CC
or Power Off, – 10V
≤
V
O
≤
10V
– 7V
≤
V
IN
≤
7V
– 7V
≤
V
CM
≤
7V
– 7V
≤
V
CM
≤
7V
(Note 5)
(Note 5)
I
O
= – 4mA
I
O
= 4mA
– 5V
≤
V
O
≤
5V
– 5V
≤
V
O
≤
5V, RXEN = V
CC
q
q
q
q
q
3
±4.0
±3.7
±10
35
120
±2
500
±200
V
V
V
V
mA
µA
Single-Ended Driver (Note 5)
V
OS
V
CMR
I
SS
I
OZ
Receivers
R
IN
Input Resistance
Differential Receiver Threshold Voltage
Differential Receiver Input Hysteresis
Single-Ended Input, Low Voltage
Single-Ended Input, High Voltage
V
OH
V
OL
I
SS
I
OZ
Output High Voltage
Output Low Voltage
Output Short-Circuit Current
Output Three-State Current
q
q
q
q
q
q
q
q
q
Single-Ended Output Voltage
Common-Mode Range
Short-Circuit Current
Three-State Output Current
q
q
q
q
q
±4.5
±3.7
±10
35
220
±2
500
±200
V
V
V
mA
µA
12
– 200
70
0.8
2
3.5
0.4
7
±2
85
±100
200
kΩ
mV
mV
V
V
V
V
mA
µA
3
LTC1323
ELECTRICAL CHARACTERISTICS
SYMBOL
Logic Inputs
V
IH
V
IL
I
C
t
PLH
, t
PHL
Input High Voltage
Input Low Voltage
Input Current
Differential Driver Propagation Delay
Differential Driver Propagation Delay
with Single-Ended Load
Single-Ended Driver Propagation Delay
Differential Receiver Propagation Delay
Single-Ended Receiver
Propagation Delay
Inverting Receiver Propagation Delay
in Keep-Alive Mode,
SHDN = 0V, CPEN = V
CC
t
SKEW
t
r
, t
f
Differential Driver Output to Output
Differential Driver Rise/Fall Time
Differential Driver Rise/Fall Time
with Single-Ended Load
Single-Ended Driver Rise/Fall Time
t
HDIS
, t
LDIS
Differential Driver Output Active
to Disable
Any Receiver Output Active to Disable
t
ENH
, t
ENL
Differential Driver
Enable to Output Active
Any Receiver, Enable to Output Active
V
EER
Supply Rise Time from Shutdown
or Receiver Keep-Alive
All Logic Input Pins
All Logic Input Pins
All Logic Input Pins
R
L
= 100Ω, C
L
= 100pF (Figures 2, 7)
R
L
= 3k, C
L
= 100pF (Figures 3, 9)
R
L
= 3k, C
L
= 100pF, (Figures 5, 10) (Note 5)
C
L
= 15pF (Figures 2, 11)
C
L
= 15pF (Figures 6, 12) (Note 5)
C
L
= 15pF (Figures 6, 12) (Note 5)
q
q
q
V
CC
= 5V
±10%,
T
A
= 0°C to 70°C (Notes 2 and 3)
MIN
2.0
0.8
±1.0
40
120
40
70
70
150
±20
120
180
120
160
160
600
TYP
MAX
UNITS
V
V
µA
ns
ns
ns
ns
ns
ns
PARAMETER
CONDITIONS
Switching Characteristics
q
q
q
q
q
q
R
L
= 100Ω, C
L
= 100pF (Figures 2, 7)
R
L
= 100Ω, C
L
= 100pF (Figures 2, 7)
R
L
= 3k, C
L
= 100pF (Figures 3, 9)
R
L
= 3k, C
L
= 100pF (Figures 5, 10) (Note 5)
C
L
= 15pF (Figures 4, 8)
C
L
= 15pF (Figures 4, 13)
C
L
= 15pF (Figures 4, 8)
C
L
= 15pF (Figures 4, 13)
C1 = C2 = 0.33µF, C
VEE
= 1µF
q
q
q
q
q
q
q
q
q
10
50
50
15
180
30
180
30
0.2
50
150
150
80
250
100
250
100
ns
ns
ns
ns
ns
ns
ns
ns
ms
The
q
denotes specifications which apply over the full operating
temperature range.
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
pins are negative. All voltages are referenced to ground unless otherwise
specified.
Note 3:
All typicals are given at V
CC
= 5V, T
A
= 25°C.
Note 4:
I
LOAD
is an external current being sunk into the V
EE
pin.
Note 5:
These specifications apply to the 24-pin SO Wide package only.
4
LTC1323
TYPICAL PERFORMANCE CHARACTERISTICS
Charge Pump Output Voltage
vs Load Current
–2.0
CHARGE PUMP OUTPUT VOLTAGE (V)
DIFFERENTIAL DRIVER OUTPUT (V)
–2.5
–3.0
–3.5
– 4.0
– 4.5
– 5.0
–5.5
– 6.0
0
3
2
1
0
–1
–2
–3
–4
–5
T
A
= 25°C
V
S
= 5V
50 100 200 300 500 1k 2k 3k
LOAD RESISTANCE (Ω)
5k 10k
SINGLE-ENDED DRIVER OUTPUT (V)
T
A
= 25°C
V
S
= 5V
R
L(DIFF)
= 100Ω
R
L(SE)
= 3k TO GND
V
TXI
= 5V
5
20
15
LOAD CURRENT (mA)
10
Supply Current vs Temperature
3.50
DIFFERENTIAL DRIVER OUTPUT (V)
SUPPLY CURRENT (mA)
3.00
2.75
2.50
2.25
2.00
1.75
1.50
–50 –25
0
50
75
25
TEMPERATURE (˚C)
100
125
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
SINGLE-ENDED DRIVER OUTPUT (V)
3.25
V
S
= 5V
NO LOAD
U W
25
LTC1323 • TPC01
LTC1323 • TPC04
Differential Driver Swing
vs Load Resistance
5
4
5
4
3
2
1
0
–1
–2
–3
–4
–5
Single-Ended Driver Swing
vs Load Resistance
T
A
= 25°C
V
S
= 5V
30
50 100 200 300 500 1k 2k 3k
LOAD RESISTANCE (Ω)
5k 10k
LTC1323 • TPC02
LTC1323 • TPC03
Differential Driver Swing
vs Temperature
5.0
4.5
V
S
= 5V
R
L
= 100Ω
5
4
3
2
1
0
–1
–2
–3
–4
Single-Ended Driver Swing
vs Temperature
V
S
= 5V
R
L
= 3k TO GND
–5
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
LTC1323 • TPC05
LTC1323 • TPC06
5
嵌入式系统
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