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Pinout for 74HTC74 ( Quad bistable transparent latch )

      74HCT75		# 1D-4D:	Data Inputs
    +---\/---+		# 1Q-4Q:	Latch Contents
 1 -|!1Q   1Q|- 16	# !1Q-!4Q:	Inverse of Latch Contents
 2 -|1D    2Q|- 15	# E12:		Clock Pulse for Q1 and Q2
 3 -|2D   !2Q|- 14	# E34:		Clock Pulse for Q3 and Q4
 4 -|E34  E12|- 13	# Gnd:		Ground
 5 -|Vcc  Gnd|- 12	# Vcc:		Power In
 6 -|3D   !3Q|- 11	#
 7 -|4D    3Q|- 10	# To use, set the 2 data bits you wish to update
 8 -|!4Q   4Q|-  9	# then strobe the appropriate enable line.
    +--------+		# NOTE: YOU MUST UPDATE 2 BITS AT A TIME!

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