Meilhaus Electronic USB interface module PMD-1024HLS ME-RedLab® PMD-1024HLS Data Sheet

1 

Measurement Computing Corporation. 

Typical for 25°C unless otherwise specified.  

Specifications in italic text are guaranteed by design. 

Table 1. Digital I/O specifications  

Digital input type 

74ACT373 

Digital output type 

74FCT244 

Number of I/O 

24 (port A0 through port C7) 

Configuration 

2 banks of 8 and 2 banks of 4 or 
3 banks of 8  

Pull up/pull-down configuration 

Internal 47K resistors may be user configured for 
pull-up or pull-down via external connection of “Port 
x Pull-up / Pull-down” to “USB +5 V” or “GND”.  
Ports A, B, and C are independently configurable. 

Input high voltage 

2.0 V min, 5.5 V absolute max 

Input low voltage 

0.8 V max, –0.5 V absolute min 

Output high voltage (IOH = -15 mA) 

2.4 V min 

Output low voltage (IOL=64 mA) 

0.55 V max 

Source current – (Note 1) 
ƒ

  Self -powered hub  

ƒ

  Externally-powered root port hub  

Maximum = 15 mA per output  

Source current – (Note 2) 
ƒ

  Bus-powered hub  

ƒ

  Battery-powered root port hub.  

Per pin maximum = 40 mA/ [number of active 
outputs]. 
15 mA max source current for any single output 

Sink current - (Note 3) 
 

Current sink max: 440 mA/ [number of outputs]. 
64 mA max sink current for any single output. 

Power up/reset state 

Input mode (high impedance)