Ordering number: ENN*6585
CMOS IC
LC7958NC
64-Bit LED Driver for 300 dpi Printers
Preliminary
Overview
LC7958NC is a 64-bit constant current LED driver IC
designed to directly drive LED head array.
The output terminals for LED drive are arranged in
2-row staggered position of 80-µm pitch at one side. It
enables drive of LED Array of 300-dpi in one side
disposition, 600dpi in both sides disposition
Features and Functions
•
Logic voltage (VDD): +5 V
±
10 %
•
LED drive current (IOH): 5.0 mA (TYP)
•
Clock frequency (fc): 10 MHz
•
Output current control circuit built in
•
Mode switching function by the SEL pin
•
Chip size: 1.43 mm
×
5.39 mm
•
Number of pads: 86
•
64-bit shift register circuit
•
64-bit latch circuit
•
Output driver on/off switching function
•
Constant current circuit
•
64-bit p-channel open drain LED driver
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft's
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
42800RM6585-1/11
LC7958NC
The characteristics shown below are those of devices encapsulated in the SANYO standard ceramic package
Specifications
Absolute Maximum Ratings
at Vss=0V
Parameter
Power supply voltage
Input voltage
Output voltage
Driver output current
Operating Junction temperature
Storage temperature
Symbol
VDD1
VDD2
VI
VO
IOUT
Tj
Tstg
Conditions
Ta = 25
°C
Ta = 25
°C
Ta = 25
°C
Ratings
-0.3 to 6.5
-0.3 to 6.5
-0.3 to VDD1+ 0.3
-0.3 to VDD1+ 0.3
0 to -10
-10 to 125
-35 to 125
V
V
mA
°C
°C
Unit
V
Allowable Operating Ranges
at Vss = 0 V, VDD1 = VDD2 = 5 V
±
10%, Ta = 0 to 100°C
Parameter
Symbol
Conditions
min
Power supply voltage
VDD1,VDD2
VDD1(pad 2),
VDD2(pad 6)
Between VDD1 and
VDD2
All inputs
CLOCK 1
CLOCK 1
SI, CLOCK 1
SI, CLOCK 1
LOAD 1, CLOCK 1
LOAD 1, CLOCK 1
LOAD 1
CLOCK 1
35
30
10
50
50
40
35
50
4.5
Ratings
typ
max
5.5
V
-0.3
2.0
0
0
0.3
VDD1
0.8
10
65
V
V
MHz
%
ns
ns
ns
ns
ns
ns
Unit
Potential difference*1
High-level input voltage
Low-level input voltage
Clock frequency
Clock duty
Setup time from SI to CLOCK1
Hold time from CLOCK1 to SI
Setup time from CLOCK1 to
LOAD1
Hold time from LOAD1 to CLOCK1
LOAD1 pulse width
CLOCK1 rise/fall time
VDF
VIH
VIL
fc
D CLK
tsc
thold
tSL
tHL
tWL
tCr
tCf
tLr
tLf
LOAD1 rise/fall time
LOAD 1
35
ns
*1:In case potential difference occurred between VDD1 and VDD2, Driver current value changes. Therefore using it with
VDD1=VDD2 is recommended.
6585-2/11
LC7958NC
Electrical Characteristics
at VSS = 0 V, VDD1 = VDD2 = 5 V
±
10%, Ta = 0 to 100
°C
Parameter
Symbol
Conditions
min
High-level output voltage
Low-level output voltage
Clock frequency
High-level input current
VOH
VOL
fc
IIH
IIL1
Low-level input current
IIL2
IIL3
All input pads: VDD1 = 5.5 V, VI =
5.5 V
LOAD1, SI, CLOCK1, STROBE,
SEL, ADJ(-), ADJ(+): VDD1 = VDD2
= 5.5 V, VI = 0 V
DO1 to DO64: operation mode 1,
High-level output current
IOH1
VDD1 = VDD2 = 5.0 V, VO = 1.6 V, -3.7
VREF = 1.8 V
High-level output current
minus correction
DO1 to DO64: operation mode 2
IOH2
VDD1 = VDD2 = 5.0 V, VO = 1.6 V, -4.5
VREF = 1.8 V
DO1 to DO64: operation mode 3
IOH3
VDD1 = VDD2 = 5.0 V, VO = 1.6 V, +4.5
VREF = 1.8 V
∆IOH
DO1 to DO64: with all bits on
DO1 to DO64: operation VDD1 =
5.5 V, VO = 0 V
VDD1: VDD1 = VDD2 = 5.5 V,
IDD
VREF = 1.8 V, fc = 10 MHz, with
DO1 to DO64 off
VDD1: VDD1 = VDD2 = 5.5 V, VREF
Standby current
IDDS
= 1.8 V, with fc stopped, with DO1
to DO64 off
2.5
4.0
mA
9.0
13.0
mA
-5.0
+5.0
%
µA
+6.0
+7.0
-6.0
-7.0
%
-5.0
-6.7
mA
-8
-40
-25
-100
LOAD2, S0, CLOCK2: IO = -200µA
LOAD2, S0, CLOCK2: IO = 200µA
10
1.0
-1.0
-50
-200
µA
VDD -
0.5
0.5
Ratings
typ
max
V
V
MHz
µA
Unit
High-level output current
plus correction
High-level output current
relative error between bits
Output off leakage current
IOL
0
-50
Operating current drain
(mode 1)
6585-3/11
LC7958NC
Switching Characteristics
at VSS = 0 V, VDD1 = VDD2 = 5 V
±
10%, Ta = 0 to 100
°C
Parameter
SO output rise time
SO output fall time
Output transmission delay
time from STROBE to DO
Output transmission delay
time from CLOCK2 to SO
CLOCK1→CLOCK2
transmission delay time
Symbol
tor
tof
tpsr
tpsf
tpcr
tpcf
tPH
tPL
CLOC1, CLOCK2, LOAD1, LOAD2:
CL=10.8 pF
40
ns
STROBE, DO1 to DO64: CL = 10.8
pF, RF = 10 kΩ
CLOCK2, SO
10
250
ns
Conditions
min
SO: CL=10.8pF
Ratings
typ
max
50
ns
Unit
70
ns
Equivalent Circuit Block Diagram
DO1
Constant
current
circuit
DO64
VDD2
VREF
64-bit constant current driver
VDD1
ADJ(+)
VSS
ADJ(-)
STROBE
SEL
LOAD1
64-bit latch
LOAD2
SI
CLOCK1
64-bit shift register
SO
CLOCK2
6585-4/11
LC7958NC
Sample Application Circuit Diagram
GND
STROBE
VREF
VSS
VDD1
VDD2
OPEN
DO1
SI
CL OCK1
LOAD1
VREF
SEL
STROBE
ADJ(-)
ADJ(+)
VSS
VDD 2
VDD 1
LOAD2
CL OCK
SO
(Input signal)
LED
array
DO64
DO 1
SI
CL OCK1
LOAD1
VREF
SEL
STROB
ADJ(-)
ADJ(+)
VSS
VDD 2
VDD 1
LOAD
CL OCK
SO
DO64
LED
array
(To the next input stage)
Note 1: The electric potential of the IC substrate is at VDD1.
Note 2: The number of cascade connection stages should be within 60. (10MHz)
Note 3: All VDD2 terminals should be bonded.
Note 4: Leave the SEL Terminal of the odd-numbered IC open, and connect the SEL terminal of even-numbered IC with
VSS.
Note 5: Apply the stable potential other than the VDD1 and VDD2 lines to the VREF terminal.
6585-5/11
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