Datasheet

SWITCHING CHARACTERISTICS
FUNCTIONAL BLOCK DIAGRAM
SCLK
IREF
XLAT
GND
G yscalra e(12Bits 24Ch´ annels)Data
ShiftRegister
12BitsPWMTiming Control
OUT0
Thermal
Detection
VCC
OU 23T
SOUT
4 MHz
Internal
Oscillator
OUT1
OU 22T
288
LSB MSB
0 287
VCC
SIN
Grayscale(12Bits 24C´ hannels)Data
DataLatch
LSB
0
288
MSB
287
BL NKA
24-Channel,C nstantCurreo ntDriver
24
D Q
CK
¼
TLC5947
www.ti.com ................................................................................................................................................. SBVS114A – JULY 2008 – REVISED SEPTEMBER 2008
At V
CC
= 3.0 V to 5.5 V, T
A
= – 40 ° C to +85 ° C, C
L
= 15 pF, R
L
= 150 Ω , R
IREF
= 1.6 k Ω , and V
LED
= 5.5 V. Typical values at
V
CC
= 3.3 V and T
A
= +25 ° C, unless otherwise noted.
TLC5947
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t
R0
SOUT 10 15 ns
Rise time
t
R1
OUTn 15 40 ns
t
F0
SOUT 10 15 ns
Fall time
t
F1
OUTn 100 300 ns
Internal oscillator
f
OSC
2.4 4 5.6 MHz
frequency
t
D0
SCLK ↓ to SOUT 15 25 ns
t
D1
BLANK ↑ to OUT0 sink current off 20 40 ns
t
D2
Propagation delay time OUT0 current on to OUT1/5/9/13/17/21 current on 15 24 33 ns
t
D3
OUT0 current on to OUT2/6/10/14/18/22 current on 30 48 66 ns
t
D4
OUT0 current on to OUT3/7/11/15/19/23 current on 45 72 99 ns
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