INTEGRATED CIRCUITS
DATA SHEET
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• The IC04 LOCMOS HE4000B Logic
Family Specifications HEF, HEC
• The IC04 LOCMOS HE4000B Logic
Package Outlines/Information HEF, HEC
HEF4754V
LSI
18-element bar graph LCD driver
Product specification
File under Integrated Circuits, IC04
January 1995
Philips Semiconductors
Product specification
HEF4754V
LSI
18-element bar graph LCD driver
DESCRIPTION
The HEF4754V drives an 18-element bar graph LCD in linear relation to the control voltage (Vc) in a pointer or
thermometer mode.
Fig.1 Functional diagram.
FAMILY DATA
See Family Specifications
January 1995
2
Philips Semiconductors
Product specification
HEF4754V
LSI
18-element bar graph LCD driver
PINNING
VOSC
oscillator terminal
Vc
control voltage input
Vref min
reference voltage inputs
Vref max
I1
thermometer/pointer
(choice select input)
I2
peak value; reset/9 or 18 bars
(choice select input)
I3
reset; repetitively reset
(choice select input)
O1 to O18
bar outputs
OR
back plate output
HEF4754VP(N): 28-lead DIL; plastic
(SOT117-2)
HEF4754VD(F): 28-lead DIL; ceramic (cerdip)
(SOT135)
HEF4754VT(D): 28-lead SO; plastic
(SOT136-1)
( ): Package Designator North America
FUNCTION TABLE
I1
I2
I3
MODE
L
L
X
pointer; 18 bars
L
H
X
pointer; 9 bars
H
L
X
thermometer; no peak value
H
H
L
thermometer; peak value, repetitively
reset
H
H
H
thermometer; peak value, manually
reset
Fig.2 Pinning diagram.
Note
1. H = HIGH state (the more positive voltage)
2. L = LOW state (the less positive voltage)
3. X = state is immaterial
January 1995
3
Philips Semiconductors
Product specification
HEF4754V
LSI
18-element bar graph LCD driver
The distance between the switching levels of the
comparators is defined by the voltage difference across
this divider. The extremities of the resistor divider are
coupled via high-input amplifiers to the maximum
reference voltage input and the minimum reference
voltage input.
GENERAL DESCRIPTION
The HEF4754V drives an 18-element bar graph LCD in
linear relation to the control voltage (Vc) in a pointer or
thermometer mode. The first bar lights up when Vc is
smaller than VT(bar)2 (see equation [3] below).
In the pointer mode, the circuit can drive 9 or 18 bars; in
the thermometer mode, the circuit also drives the peak
value indication. This can be reset or repetitively reset,
after 1,5 to 2 seconds.
The digital part has one reference output (OR) to drive the
back plate, and 18 outputs (O1 to O18) to drive each bar.
Three latches and some gates are incorporated for each
bar output. An on-chip oscillator (1024 Hz) with external R
and C drives the circuit. The outputs are driven at 64 Hz.
The select inputs I1 to I3 are provided with an on-chip
pull-up element, and they may therefore be left floating
(equals HIGH state).
The circuit has analogue and digital parts. The analogue
part consists of 17 comparators, with their non-inverting
inputs connected together and coupled to the control input
Vc. The inverting inputs of the comparators are connected
in succession to the nodes of an 18-part resistor divider.
LINEARITY
VDD = 10 V; Vref max = 9,5 V; Vref min = 0,5 V; Tamb = 25 °C
∆V1 = 250 mV (this is the tolerance of the step voltage).
V step = V step"" + ∆V 1
[1]
Vstep’ is the (internal) voltage drop across the resistor-ladder
network.
( V ref max ± ∆V 2 ) – ( V ref min ± ∆V 2 )
V step′ = ---------------------------------------------------------------------------------------18
[2]
∆V2 is the maximum offset voltage spread of the on-chip
voltage follower.
∆V2 = 250 mV.
The linearity is guaranteed for VDD > 10 V.
The monotony between VDD = 5 V and 10 V is guaranteed.
During ramping-up of the input voltage a maximum of two
bars might be activated simultaneously.
ABSOLUTE VOLTAGE TRIGGER LEVEL
The absolute voltage trigger level at the Vc pin is VT(bar)n;
V T ( bar ) n = { V ref min ± ∆V 2 * } + { ( n – 1 ) V step ′ ± ∆V 1 } , in which
n = number of bars; 2 ≤ n ≤ 18.
For n = 1 (first bar) see text above.
Note
* For ∆V2 the same sign (+ or −) should be used as in equation [2].
January 1995
4
[3]
Philips Semiconductors
Product specification
HEF4754V
LSI
18-element bar graph LCD driver
RATINGS
Limiting values in accordance with the Absolute Maximum System (IEC 134)
−0,5 to + 18 V
Supply voltage
VDD
Voltage on any input
VI
−0,5 to VDD + 0,5 V
D.C. current into any input or output
± II
max
Storage temperature
Tstg
−25 to + 125 °C
Operating ambient temperature
Tamb
−20 to + 85 °C
10 mA
DC CHARACTERISTICS
VSS = 0 V
Tamb (°C)
VDD
V
−40
SYMBOL
MIN.
Quiescent device
current
Input leakage
5
Output voltage
LOW
HIGH
Output current
LOW
control input Vc
−
−
−
−
µA
1000
−
−
µA
−
1600
−
−
µA
5
−
−
−
−
100
−
−
nA
−
−
−
−
100
−
−
nA
−
−
−
−
100
−
−
nA
3,5
−
3,5
−
−
3,5
−
V
± IIN
5
10
VIH
5
10
VIL
7,0
−
7,0
−
−
7,0
−
V
11,0
−
11,0
−
−
11,0
−
V
−
1,5
−
−
1,5
−
1,5
V
−
3,0
−
−
3,0
−
3,0
V
−
4,0
−
−
4,0
−
4,0
V
4,99
−
4,99
−
−
4,95
−
V
9,99
−
9,99
−
−
9,95
−
V
15
−
−
14,99
−
−
−
−
V
5
−
0,01
−
−
0,01
−
0,05
V
−
0,01
−
−
0,01
−
0,05
V
5
10
10
VOH
VOL
−
0,01
−
−
0,01
−
0,05
V
0,36
−
0,3
−
−
0,24
−
mA
0,80
−
0,7
−
−
0,56
−
mA
15
3,0
−
2,8
−
−
2,60
−
mA
5
0,34
−
0,3
−
−
0,24
−
mA
1,00
−
0,9
−
−
0,72
−
mA
4,40
−
4,0
−
−
3,20
−
mA
−
−
0
−
5
−
−
V
−
−
0
−
10
−
−
V
−
−
0
−
15
−
−
V
5
10
10
−IOH
IOL
5
10
15
January 1995
−
−
15
Input voltage
−
−
15
Output current
−
−
15
HIGH
MAX.
−
IDD
15
Output voltage
MIN.
−
10
select inputs
MAX.
−
15
Input voltage LOW
TYP.
NOTES
−
10
current (except)
select inputs
MIN.
+ 85
15
select inputs)
Input voltage HIGH
MAX.
+ 25
VIC
5
1
2
3
3
4
5
6
Philips Semiconductors
Product specification
HEF4754V
LSI
18-element bar graph LCD driver
Tamb (°C)
VDD
V
−40
SYMBOL
MIN.
Max. input voltage
Vref max input
Min. input voltage
Vref min input
−
5
MIN.
TYP.
+ 85
MAX.
−
4,5
−
4,5
MAX.
−
−
V
−
−
4,5
−
9,5
−
−
V
−
−
4,5
−
14,5
−
−
V
5
−
−
0,5
−
0,5
−
−
V
10
10
VIRmax
VIRmin
10
IDD
−
−
0,5
−
5,5
−
−
V
−
−
0,5
−
10,5
−
−
V
−
−
−
750
−
−
−
µA
Notes
1. Vref min = 0,5 V; Vref max = 9,5 V; Vosc = Vc = 0 V; I1, I2 and I3 at VDD.
2. Pin under test at VSS or VDD, all other inputs simultaneously at VSS or VDD.
3. IO = 0; all inputs at VSS or VDD.
4. At VDD = 5 V: VOH = 4,5 V.
At VDD = 10 V: VOH = 9,5 V.
At VDD = 15 V: VOH = 13,5 V.
5. At VDD = 5 V: VOL = 0,4 V; inputs at VSS or VDD.
At VDD = 10 V: VOL = 0,5 V; inputs at VSS or VDD.
At VDD = 15 V: VOL = 1,5 V; inputs at VSS or VDD.
6. Vref min + 4 V < Vref max.
January 1995
MIN.
NOTES
15
15
Operating supply
current
MAX.
+ 25
6
6
6
Fig.3
Philips Semiconductors
18-element bar graph LCD driver
January 1995
7
Product specification
HEF4754V
LSI
Fig.3 Typical operating set-up.