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XR-2271 Datasheet Preview

XR-2271 Datasheet

Fluorescent Display Driver

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XR-2271
Fluorescent Display Driver
GENERAL DESCRIPTION
The XR-2271 is a monolithic 7-digit or 7-segment dis-
play driver designed to interface MaS logic with fluores-
cent displays. It features active high logic and low input
current. Each XR-2271 is capable of driving seven digits
or segments of a display panel and provides complete
input and output isolation. Since the output pull up re-
sistors are incorporated on chip, no external parts are
required to interface fluorescent displays.
FUNCTIONAL BLOCK DIAGRAM
INPUTS
FEATURES
Active High Logic
Low Input Current
Complete Input Output Isolation
Output Pull Up Resistors On Chip
No External Parts Required To Drive
Fluorescent Displays
APPLICATIONS
Fluorescent Display Driver
MaS Logic/High-Voltage Interface
ORDERING INFORMATION
Part Number
XR-2271CN
XR-2271CP
Package
Ceramic
Plastic
Operating Temperature
O°C to + 70°C
O°C to + 70°C
ABSOLUTE MAXIMUM RATINGS (Note 1)
VSS - V -
inpui io V-
Outputs to V-
ISS
Power Dissipation TA :S 25°C
Derate above 25°C
Storage Temperature
50V Max.
50V Max.
50V Max.
20 mA Max.
625 mW Max.
5 mW/oC
-65°C to + 150°C
SYSTEM DESCRIPTION
The XR-2271 fluorescent display driver requires no ad-
ditional components to interface seven segment fluo-
rescent displays to MaS Logic. The output is an emitter
follower and can switch up to 50V at 20 mA. All inputs
are protected to 50V and pull up resistors are inte-
grated onto the device.
7-2




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XR-2271 Datasheet Preview

XR-2271 Datasheet

Fluorescent Display Driver

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ELECTRICAL CHARACTERISTICS (TA = + 25°C, VSS = OV, V- -40V, Note 2)
XRII2271
PARAMETERS
Logical "1"
Input Voltage
Logical "0"
Input Voltage
Logical "1"
Input Current
MIN
-1.2
TYP
0.25
MAX
0
-6
0.8
Logical "0"
Input Current
Logical "1"
Output Voltage
Logical "0"
Output Voltage
Output Pull
Down Resistance
-50
-2.0
0
-90
-0.9
-40
45
50
0
-38
Output Pull
Down Current
350
Power Supply
Current
-1.2
-7
-1.4
-12.0
AC Parameters (TA = +25°C, Test Circuit Figure 2)
UNITS
V
V
mA
p.A
p.A
V
V
KO
p.A
mA
mA
SYMBOL
Vin on
Vin off
lin on
lin off
Vo on
Vo off
RO
IS
I-off
I-on
CONDITIONS
Va = -2.0V
10 = -7.5 mA
Vo = V- +2V
Vin = -1.2V
Va = -2.0V
Va = V- +2V
Vin = -6V
Vin = -15V
Va on
Vin = -6V
Vin = -6V
Note 3
Vo = -5V
Vin = -6V
Note 3
All inputs -6V
All inputs - 1.2V
PARAMETERS
MIN TYP MAX UNITS SYMBOL
CONDITIONS
Output on
Delay Time
Output on
Rise Time
15
0.5 2
p.S
p.S
td
CL = 25 pF
RL = 10 KO
tr
CL = 25 pf
RL = 10K
Output off
Storage Time
0.8 5
p.S
CL = 25 pF
ts RL = 10 KO
Output off
Fall Time
0.6 2.0
2 25
p.S
p.S
CL = 25 pF
tf RL = 10K
=RL 00
Note 1. The "Absolute Maximum Ratings" are those values beyond which the device may be damaged.
Note 2. All voltages measured with respect to VSS unless otherwise noted. Positive current flow is into a device pin.
Note 3. The output pull down resistance is an N channel junction FET. For Vo ,.. V - it is resistive, and for IVo -
(V - ) I > 20V, it is current sink.
INPUT
115-91
r-----
I
15
12v
'NPUT~
lV .,
3V
.v
I
I I 'R I
I
I
:'__+___ ;.ov--
OlHPUT
-+I~f- ____~_ ~""" I
I~~'DI I
II
ton tolt
I
I
I
_ _ _I TYPICAL
l2~~~E~
1
v-
EQUIVALENT SCHEMATIC DIAGRAM
Figure 2. XR-2271 AC Parameter Test Circuit
7-3


Part Number XR-2271
Description Fluorescent Display Driver
Maker Exar
Total Page 2 Pages
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