SANYO LC7958NC Datasheet

Ordering number: ENN*6585

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

CMOS IC

LC7958NC

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 chara ct e ri st i cs s ho wn b e l o w a re th os e o f devi ce s e n c aps ul at e d in t he S ANYO s t a n dard c era m i c p a ckage

Specifications

Absolute Maximum Ratings at Vss=0V

Parameter Symbol Conditions Ratings Unit

Power supply voltage

Input voltage VI Ta = 25 °C -0.3 to VDD1+ 0. 3 V Output voltage VO Ta = 25 °C -0.3 to VDD1+ 0. 3 V Driver output current IOUT 0 to -10 mA Operating Junction temperature Tj -10 to 1 2 5 °C Storage temperature Tstg -35 to 1 2 5 °C

VDD1 -0.3 to 6. 5 VDD2

Ta = 25 °C

-0.3 to 6. 5

Allowable Operating Ranges at Vss = 0 V, VDD1 = VDD2 = 5 V ± 10%, Ta = 0 to 100°C

Parameter Symbol Conditions

Power supply voltage

Potential difference*1 VDF

High-level input voltage VIH 2.0 VDD1 V Low-level input voltage VIL

VDD1,VDD2

VDD1(pad 2), VDD2(pad 6)

Between VDD1 a nd VDD2

All inputs

Ratings

min typ max

4.5 5.5

-0.3 0 0.3

0 0.8 V

Unit

Clock frequency fc CLOCK 1 1 0 M Hz Clock duty D CLK CLOCK 1 35 5 0 6 5 % Setup time from SI to CLOCK1 tsc SI, CLOCK 1 3 0 ns Hold time from CLOCK1 to S I thold SI, CLOCK 1 1 0 ns Setup time from CLOCK1 to

LOAD1 Hold time from LOAD1 to CLOCK1 tHL LOAD 1, CLOCK 1 50 n s LOAD1 pulse width tW L LOAD 1 40 ns

CLOCK1 rise/fall time

LOAD1 rise/fall time

*1:In case potential difference occurred between VDD1 and VDD2, Driver current value changes. Therefore using it with VDD1=VDD2 is recommended.

tS L LOAD 1, CLOCK 1 5 0 ns

tCr

CLOCK 1 3 5 n s

tCf tLr

LOAD 1 3 5 ns

tLf

6585-2/11

LC7958NC

Electrical Characteristics at VSS = 0 V, VDD1 = VDD2 = 5 V ± 10%, Ta = 0 to 100°C

Parameter Symbol Conditions

min typ max

High-level output voltage VOH LOAD2, S0, CLOCK2: IO = -200µA

Low-level output voltage VOL LOAD2, S0, CLOCK2: IO = 2 00µA 0.5 V Clock frequency fc 10 MHz

High-level input current IIH

IIL1 -1.0 IIL2 -8 -25 -50Low-level input current IIL3

High-level output current IOH1

High-level output current

IOH2

minus correction

High-level output current

IOH3

plus correction

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, VDD1 = VDD2 = 5.0 V, VO = 1.6 V, VREF = 1.8 V

DO1 to DO64: operation mode 2 VDD1 = VDD2 = 5.0 V, VO = 1.6 V, VREF = 1.8 V

DO1 to DO64: operation mode 3 VDD1 = VDD2 = 5.0 V, VO = 1.6 V, VREF = 1.8 V

VDD -

0.5

-40 -100 -200

-3.7 -5.0 -6.7 mA

-4.5 -6.0 -7.0

+4.5 +6.0 +7.0

Ratings

Unit

1.0 µA

µA

High-level output current

∆IOH DO1 to DO64: with all bits o n -5.0 +5.0 %

relative error between bits

Output off leakage current IO L

Operating current drain

IDD

(mode 1)

Standby current IDDS

DO1 to DO64: operation VDD1 =

5.5 V, VO = 0 V VDD1: VDD1 = VDD2 = 5.5 V ,

VREF = 1.8 V, fc = 10 MHz, with DO1 to DO64 o f f

VDD1: VDD1 = VDD2 = 5.5 V, VRE = 1.8 V, with fc stopped, with DO1 to DO64 of f

0 -50 µA

9.0 13.0 m A

2.5 4.0 mA

6585-3/11

LC7958NC

Switching Characteristics at VSS = 0 V, VDD1 = VDD2 = 5 V ± 10%, Ta = 0 to 100°C

Parameter Symbol Conditions

SO output rise time SO output fall time t of

time from STROBE to DO

time from CLOCK2 to SO CLOCK1→CLOCK2

transmission delay time tPL

tor

tpsrOutput transmission delay tpsf tpcrOutput transmission delay tpcf tPH

Eq uivalent Circui t Block Diagram

Constant

VREF

current

circuit

Ratings

Unit

min typ max

SO: CL=10.8pF 50 ns

STRO BE , DO1 to DO6 4: CL = 1 0.8

250 ns

pF, RF = 10 kΩ

CLOCK2, SO 1 0 7 0 ns

CLOC1, CLOCK2, LOAD1, LOAD2:

40 ns

CL=10.8 pF

DO64DO1

VDD2

64-bit constant current driver

VDD1

ADJ(+)

ADJ(-)

STROBE

SEL

LOAD1

CLOCK1

64-bit latch

64-bit shift register

VSS

LOAD2

CLOCK2

6585-4/11

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