Metrologic Instruments IS4921 - Manual (Page 41)

35
DC Operating Voltages
Signal Signal Description MIN MAX Condition
VIN Operating Voltage 3V 5.5V
VIH(1) Input High (RX, CTS) 2.5V
VIL(1) Input Low (RX, CTS) .8V
VIH(2) Input High (TTL_INV, nWake) .8xVIN
VIL(2) Input Low (TTL_INV, nWake) .8V
VIH(3) Input High (Trigger) .8xVIN
VIL(3) Input Low (Trigger) .25V
VOH(1) Output High Voltage (TX,RTS) .8xVIN Isource = 16 mA
VOL(1) Output Low Voltage (TX,RTS) .14xVIN Isink = 16 mA
VOH(2) Output High Voltage (nBeeper, nGoodRead) *** 5.5V
VOL(2) Output Low Voltage (nBeeper, nGoodRead) .6V Isink = 25 mA
VOH(3) Output High Voltage (Power down) *** 5.5V
VOL(3) Output Low Voltage (Power down) .2V Isink = 8 mA
*** PWRDWN, nGoodRead, and nBeeper are open drain outputs w/ 100K pull-ups to VIN. Actual VOH will be
determined by the parallel resistance of the 100K pull up and any external impedance.
Current Draw @ 25°C
USB TTL
Signal Signal Description
VIN = 3.3V VIN = 5V VIN = 3.3V VIN = 5V
Continuous
Scan mode Average current draw during continuous
scan mode*
235 mA 175 mA 200 mA 140 mA
Idle Average current draw while in idle mode 160 mA 120 mA 125 mA 85 mA
Sleep Average current draw while in sleep mode 65 mA 65 mA 25 mA 25 mA
Suspend
Mode (USB) Average current draw in USB suspend
(USB version only)
600 µA 650 µA N/A N/A
Power Down
Mode (TTL) Average current draw in power down mode
(TTL Version Only)
N/A N/A 500 µA 500 µA
* Note: Continuous Scan Mode current will vary based on object size, distance, and type. The numbers listed
above are typical.