74HCU04 Datasheet, PDF (6/7 Pages) NXP Semiconductors – Hex inverter

Philips Semiconductors
Hex inverter
Product specification
74HCU04
Fig.10 Test set-up for measuring forward
transconductance g_fs = di_o/dv_i at v_o is constant
(see also graph Fig.11).
APPLICATION INFORMATION
Some applications for the “HCU04” are:
• Linear amplifier (see Fig.12)
• In crystal oscillator designs (see Fig.13)
• Astable multivibrator (see Fig.14)
Fig.11 Typical forward transconductance g_fs as a
function of the supply voltage V_CC at
T_amb = 25°C.
Z_L > 10 kΩ; A_OL = 20 (typ.)
A_u = –-1----₊-----RR----------12-----A--₍--^O-1---^L-₊-----A-----_O---_L---₎--;
V_{O max (p-p)} ≈ V_CC −2 V centered at ¹â„₂V_CC
3 kΩ ≤ R1, R2 ≤ 1 MΩ
Typical unity gain bandwidth product is 5 MHz.
C_I (see Fig.15)
A_OL = open loop amplification
A_u = voltage amplification
Fig.12 HCU04 used as a linear amplifier.
September 1993
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