MC14489 Ver la hoja de datos (PDF) - Motorola => Freescale
Número de pieza
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MC14489 Datasheet PDF : 20 Pages
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C7 C6 C5 C4 C3 C2 C1 C0
1ST BYTE
SHIFTED IN
CONFIGURATION
REGISTER OF
DEVICE 2 IN
FIGURE 11
2ND BYTE
DON’T CARE
3RD BYTE
4TH BYTE
DON’T CARE
CONFIGURATION
REGISTER OF
DEVICE 1 IN
FIGURE 11
(a) Configuration Registers
D23 D22 D21 D20 D19 D18 D17 D16 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
1ST BYTE
SHIFTED IN
2ND BYTE
3RD BYTE
4TH BYTE
5TH BYTE
6TH BYTE
h BITS
AND
DIMMER
BIT
BANK
5
NIBBLE
BANK
4
NIBBLE
BANK
3
NIBBLE
BANK
2
NIBBLE
BANK
1
NIBBLE
h BITS
AND
DIMMER
BIT
BANK
5
NIBBLE
BANK
4
NIBBLE
BANK BANK BANK
3
2
1
NIBBLE NIBBLE NIBBLE
DISPLAY REGISTER OF DEVICE 2
IN FIGURE 11
DISPLAY REGISTER OF DEVICE 1
IN FIGURE 11
(b) Display Registers
NOTE: ENABLE (which initially must be inactive high) is kept active–low during the entire 4–byte configuration transfer or 6–byte display
transfer. When ENABLE is brought back high, either a 4– or 6–byte transfer occurs in the cascaded devices, depending on the number
of bytes in the transfer.
Figure 8. Bit Stream Formats for Two Devices Cascaded
35
5 V SUPPLY
30
BIT D23 = HIGH (BRIGHTEN LEDs)
WITH D23 = LOW, iOH IS CUT BY ∼50%.
25
20
15
10
5
400 800
1.2 k 1.6 k 2.0 k 2.4 k 2.8 k 3.2 k
Rx, EXTERNAL RESISTOR (Ω)
3.6 k 4.0 k
NOTE: Drive current tolerance is approximately ± 15%.
Figure 9. a through h Nominal Current per Output versus Rx
MC14489
10
MOTOROLA
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