LMH7322 datasheet(13/33 Pages) TI1

13 / 33 page

LMH7322

www.ti.com

SNOSAU8H – MARCH 2007 – REVISED MAY 2011

Table 1. Definitions (continued)

Symbol

Text

Description

Hyst

Hysteresis

Difference between the switching point ‘0’ to ‘1’ and vice versa.

IB-LE

Latch Enable Bias Current

Current flowing in or out of the input pins, when both are biased at normal PECL

levels.

IOS-LE

Latch Enable Offset Current

Difference between the input bias current of the LE and LE pin.

TC IOS-LE

Temp Coefficient Latch Enable Offset

Temperature coefficient of IOS-LE.

Current

VOS-LE

Latch Enable Offset Voltage

Voltage difference needed between LE and LE to place the part in the latched or

the transparent state.

TC VOS-LE

Temp Coefficient Latch Enable Offset

Temperature coefficient of VOS-LE.

Voltage

VRI-LE

Latch Enable Voltage Range

Voltage which can be applied to the LE input pins without damaging the device.

VRID-LE

Latch Enable Differential Voltage Range

Differential Voltage between LE and LE at which the clamp isn’t working. The

difference can be as high as the supply voltage but excessive input currents are

flowing through the clamp diodes and protection resistors.

VOH

Output Voltage High

High state single ended output voltage (Q or Q) (see Figure 34).

VOL

Output Voltage Low

Low state single ended output voltage (Q or Q) (see Figure 34).

VOD

average of VODH and VODL

(VODH + VODL)/2.

IVCCI

Supply Current Input Stage

Supply current into the input stage.

IVCCO

Supply Current Output Stage

Supply current into the output stage while current through the load resistors is

excluded.

IVEE

Supply Current VEE pin

Current flowing to the negative supply pin.

Maximum Toggle Rate

Maximum frequency at which the outputs can toggle between the nominal VOH

and VOL.

Pulse Width

Time from 50% of the rising edge of a signal to 50% of the falling edge.

tPDH resp tPDL Propagation Delay

Delay time between the moment the input signal crosses the switching level L to

H and the moment the output signal crosses 50% of the rising edge of Q output

(tPDH), or delay time between the moment the input signal crosses the switching

level H to L and the moment the output signal crosses 50% of the falling edge of

Q output (tPDL).

tPDL resp tPDH

Delay time between the moment the input signal crosses the switching level L to

H and the moment the output signal crosses 50% of the falling edge of Q output

(tPDL), or delay time between the moment the input signal crosses the switching

level H to L and the moment the output signal crosses 50% of the rising edge of

Q output (tPDH).

tPDLH

Average of tPDH and tPDL.

tPDHL

Average of tPDL and tPDH.

tPD

Average of tPDLH and tPDHL.

tPDHd resp

Delay time between the moment the input signal crosses the switching level L to

tPDLd

H and the zero crossing of the rising edge of the differential output signal (tPDHd),

or delay time between the moment the input signal crosses the switching level H

to L and the zero crossing of the falling edge of the differential output signal

(tPDLd).

tOD-disp

Input Overdrive Dispersion

Change in tPD for different overdrive voltages at the input pins.

tSR-disp

Input Slew Rate Dispersion

Change in tPD for different slew rates at the input pins.

tCM-disp

Input Common Mode Dispersion

Change in tPD for different common mode voltages at the input pins.

ΔtPDLH resp

Q to Q Time Skew

Time skew between 50% levels of the rising edge of Q output and the falling

ΔtPDHL

edge of output (

ΔtPDLH), or time skew between 50% levels of falling edge of Q

output and rising edge of Q output (

ΔtPDHL).

ΔtPD

Average Q to Q Time Skew

Average of tPDLH and tPDHL for L to H and H to L transients.

ΔtPDd

Average Diff. Time Skew

Average of tPDHd and tPDLd for L to H and H to L transients.

tr / trd

Output Rise Time (20% - 80%)

Time needed for the (single ended or differential) output voltage to change from

20% of its nominal value to 80%.

tf / tfd

Output Fall Time (20% - 80%)

Time needed for the (single ended or differential) output voltage to change from

80% of its nominal value to 20%.

tsLE

Latch Setup Time

Time the input signal has to be stable before enabling the latch functionality.

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