6277 Datasheet, PDF (1/12 Pages) Allegro MicroSystems – 8-BIT SERIAL-INPUT, CONSTANTCURRENT LATCHED LED DRIVER

6277
PRELIMINARY INFORMATION ^{8-BIT SERIAL-INPUT, CONSTANT-}
(Subject to change without notice) _{CURRENT LATCHED LED DRIVER}
July 20, 2000
A6277ELW
LOGIC
GROUND ¹
SERIAL
DATA IN ²
CLOCK 3 ^CK
LATCH
ENABLE
4
L
HIGH/LOW
(CURRENT)
5
POWER
GROUND ⁶
SUB
OUT ₀ 7
OUT₁ 8
OUT ₂ 9
V_DD 20
I_O
REGULATOR
19
18
FF
17
OE 16
REGISTER
LATCHES
15
SUB
14
LOGIC
SUPPLY
R_EXT
SERIAL
DATA OUT₁
SERIAL
DATA OUT₂
OUTPUT
ENABLE
POWER
GROUND
OUT ₇
13 OUT₆
12 OUT₅
The A6277x is specifically designed for LED-display applications.
Each BiCMOS device includes an 8-bit CMOS shift register, accompa-
nying data latches, and eight npn constant-current sink drivers. Two
package styles and two operating temperature ranges are available.
The CMOS shift register and latches allow direct interfacing with
microprocessor-based systems. With a 5 V logic supply, typical serial
data-input rates are up to 20 MHz. The LED drive current is deter-
mined by the user’s selection of a single resistor. A CMOS serial data
output permits cascade connections in applications requiring additional
drive lines. For inter-digit blanking, all output drivers can be disabled
with an ENABLE input high. In addition, a HIGH/LOW function
enables full selected current with the application of a logic low, or 50%
selected current with the application of a logic high.
OUT₃ 10
11 OUT₄
Dwg. PP-029-17A
Note that the A6277EA (DIP) and the A6277ELW
(SOIC) are electrically identical and share a
common terminal number assignment.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V_DD ...................... 7.0 V
Output Voltage Range,
V_O ............................ -0.5 V to +24 V
Output Current, I_O ....................... 150 mA
Input Voltage Range,
V_I .................... -0.4 V to V_DD + 0.4 V
Package Power Dissipation,
P_D ..................................... See Graph
Operating Temperature Range, T_A
Suffix ‘S-’ ................ -20°C to +85°C
Suffix ‘E-’ ................ -40°C to +85°C
Storage Temperature Range,
T_S ........................... -55°C to +150°C
Caution: These CMOS devices have input
static protection (Class 2) but are still suscep-
tible to damage if exposed to extremely high
static electrical charges.
The first character of the part number suffix determines the device
operating temperature range. Suffix ‘E–’ is for -40°C to +85°C, and
suffix ‘S–’ is -20°C to +85°C. Two package styles are provided for
through-hole DIP (suffix ‘–A’) or surface-mount SOIC (suffix ‘–LW’)
applications. The copper lead frame and low logic-power dissipation
allow the dual in-line package to sink 122 mA through all outputs
continuously over the operating temperature range (1.0 V drop,
+85°C).
FEATURES
I To 150 mA Constant-Current Outputs
I 24 V Outputs
I Under-Voltage Lockout
I Low-Power CMOS Logic and Latches
I High Data Input Rate
I Similar to Toshiba TD62715FN
I High/Low Output Current Function
Always order by complete part number, e.g., A6277EA .