TC1426 Datasheet, PDF (3/6 Pages) TelCom Semiconductor, Inc – 1.2A DUAL HIGH-SPEED MOSFET DRIVERS

1.2A DUAL HIGH-SPEED MOSFET DRIVERS
1
TC1426
TC1427
TC1428
ELECTRICAL CHARACTERISTICS: Over operating temperature range with 4.5V ≤ V_DD + ≤ 16V unless
Symbol
Parameter
otherwise specified.
Test Conditions
Min
Typ
2 _{Max Unit}
Input
V_IH
Logic 1, Input Voltage
3
—
—
V
V_IL
I_IN
Output
V_OH
Logic 0, Input Voltage
Input Current
High Output Voltage
0V ≤ V_IN ≤ V_DD
Test Figures 1 and 2
—
—
– 10
—
V_DD – 0.025 —
0.8
V
10
µA
3
—
V
V_OL
Low Output Voltage
Test Figures 1 and 2
—
—
0.025 V
R_O
Output Resistance
V_IN = 0.8V,
I_OUT = 10mA, V_DD = 16V
—
15
23
Ω
V_IN = 3V,
—
10
18
I
Latch-Up Current
I_OUT = 10mA, V_DD = 16V
Withstand Reverse Current
> 500
—
4 —
mA
Switching Time (Note 1)
t_R
Rise Time
Test Figures 1 and 2
—
—
60 nsec
t_F
Fall Time
t_D1
Delay Time
t_D2
Delay Time
Power Supply
Test Figures 1 and 2
Test Figures 1 and 2
Test Figures 1 and 2
—
—
40 nsec
—
—
125 nsec
—
—
5 ^{125 nsec}
I_S
Power Supply Current
V_IN = 3V (Both Inputs)
V_IN = 0V (Both Inputs)
—
—
13
mA
—
—
0.7
Note: 1. Switching times guaranteed by design.
SUPPLY BYPASSING
Large currents are required to charge and discharge
capacitive loads quickly. For example, charging a 1000-pF
load to 16V in 25nsec requires an 0.8A current from the
device power supply.
To guarantee low supply impedance over a wide fre-
quency range, a parallel capacitor combination is recom-
mended for supply bypassing. Low-inductance ceramic
MLC capacitors with short lead lengths (< 0.5-in.) should
be used. A 1.0-µF film capacitor in parallel with one or two
0.1-µF ceramic MLC capacitors normally provides adequate
bypassing.
GROUNDING
The TC1426 and TC1428 contain inverting drivers.
Individual ground returns for the input and output circuits or
a ground plane should be used. This will reduce negative
feedback that causes degradation in switching speed char-
acteristics.
TELCOM SEMICONDUCTOR, INC.
6 INPUT STAGE
The input voltage level changes the no-load or quies-
cent supply current. The N-channel MOSFET input stage
transistor drives a 2.5 mA current source load. With a logic
"1" input, the maximum quiescent supply current is 9mA.
Logic "0" input level signals reduce quiescent current to 500
µA maximum. Unused driver inputs must be connected
to V_DD or GND. Minimum power dissipation occurs for logic
7 "0" inputs for the TC1426/27/28.
The drivers are designed with 100 mV of hysteresis.
This provides clean transitions and minimizes output stage
current spiking when changing states. Input voltage thresh-
olds are approximately 1.5V, making logic "1" input any
voltage greater than 1.5V up to V_DD. Input current is less
than 1µA over this range.
The TC1426/27/28 may be directly driven by the TL494,
8 ^{SG1526/27, TC38C42, TC170 and similar switch-mode}
power supply integrated circuits.
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